Because it doesn't fall under any current category.
When your support takes 
it's trolling. But they aren't inting, they're not afk, not toxic in chat, and not using hate speech. Riot, please just add a "Trolling" option under report.
archerno14 votesThats what MF support is supposed to build...
http://www.probuilds.net/guide/show/OCE/174223890/563169 http://www.probuilds.net/guide/show/NA/2536000095/59189004 http://www.probuilds.net/guide/show/NA/2498241812/72411076
You want someone banned for following most optimal and META build for MF support?
General Esdeath 1 votesSeeing as they don't know how to play MF, didn't try in normals, and just first time copied a higher elo player in ranked? Yes.
archerno13 votesSeeing as they don't know how to play MF, didn't try in normals, and just first time copied a higher elo player in ranked? Yes.
And yet he finished with good KDA and played very well. Look at yourself before pointing fingers at MF. You are Viktor main yet u ended with such pathetic CS.
General Esdeath 1 votesI'm not a Viktor main, he's just my pick whenever I have no idea what the enemy is picking. Check my mastery, I don't even have level 6 on him LOL
Deep Terror Nami3 votesIsn't there a griefing option?
Edit: Also like archer said, that isn't trolling. It's a legitimate pick and build.
General Esdeath 1 votesI feel griefing is more of actions that taking roles or items that don't work together. And I'm not sure what Riot considers griefing.
archerno13 votesI feel griefing is more of actions that taking roles or items that don't work together. And I'm not sure what Riot considers griefing.
But those items DO work together. MF deals mixed Magic and Physical damage and those items best synergize with her abilities. Her ulti does Physical damage and benefits from both AP and AD and apply Black Cleaver stacks. While her E does MAGIC damage and slows which works great with . All she needed next is Mortal Reminder and she would have perfect build.
Bad MF supports that i have seen go with 
which are completely pointless. This guy did research. He built absolutely perfect
General Esdeath 1 votesNot even in this case, I mean in general. What is Riot's definition of trolling.
ModUlanopo4 votesAnd I'm not sure what Riot considers griefing.
The simplest definition is deliberate actions to prevent a win or to harass. This player did neither.
The interesting thing here is that this is exactly what we're talking about when we talk about "off-meta" supports. The MF clearly filled all the traditional expectations of a support: not taking CS, warding and avoiding taking kills where they can. Just because it isn't a traditional support champion doesn't mean the MF failed to support.
General Esdeath 1 votesI don't care about off meta, but could griefing then include afk/flaming?
ModUlanopo1 votesI don't care about off meta, but could griefing then include afk/flaming?
Well, clearly you do care about off-meta, as your OP discusses their build and not their behavior.
Let's break this down into parts:
Yes, going AFK and being toxic in chat are punishable behaviors.
No, building in a way you don't approve of and choosing a non-traditional champion to fill a role are not punishable behaviors.
General Esdeath 1 votesWell if DTN said it's not griefing then that discussion is over, but I'm actually curious as to what Riot considers as griefing.
scazzman1 votesWell, clearly you do care about off-meta, as your OP discusses their build and not their behavior.
Let's break this down into parts:
Yes, going AFK and being toxic in chat are punishable behaviors.
No, building in a way you don't approve of and choosing a non-traditional champion to fill a role are not punishable behaviors.
That didn't answer his question. Afk farming = deliberately avoiding helping the team, but not explicitly inting or going afk. Often times an afk farmer will pretend to be split pushing, however they will recall whenever they are about to do damage to a tower, or if their jungler tries to assist them.
Is this punishable?
ModUlanopo1 votesOften times an afk farmer will pretend to be split pushing, however they will recall whenever they are about to do damage to a tower, or if their jungler tries to assist them.
I'm curious how you would distinguish that from someone who is behind in gold and is simply split-farming.
scazzman1 votesI'm curious how you would distinguish that from someone who is behind in gold and is simply split-farming.
usually, they will let you know, unless they're playing nasus, tryndamere, or another hard splitpusher, in which case its usually assumed to be implied, a troll will usually offer subtle hints that theyre trolling, without outright admitting to it in chat
if you ask me, riot should be doing things to disuade people from simply /mute alling at the start of a game, its becoming the go to cop out for players, maybe make it so if you have more then 2 players muted for more then a certain amount of time in the game. you lose honor. and often times. people who mute all are accused of being trolls, because when theyre asked why they're doing something. theyre simply silent because they muted their team from the start. and it generally just causes players to tilt when they realize they essentially have a bot on their team.
ModUlanopo1 votesI was discussing split-_farming _- where someone who is behind sits in lane to farm EXP and gold - not split-pushing.
Sp33d Zer01 votesThere are a lot of things that were considered to be troll picks. Vi jungle was considered trolling on her release because she was debuted as a top laner. Graves was meant to be an adc, Diana was a god tier mid laner who was designed to jungle, fiddlesticks isn't designed to be a support.
Just because something is off meta doesn't mean it doesn't work. Hell, support MF was an lcs pick/ban to deal with zyra.
General Esdeath 1 votesI remember those days. And it was just that, a counter pick, it's not really good outside of that role.
Sp33d Zer01 votesI'm not saying it's a good pick right now. In fact, it is the worst "support" pick listed on op.gg. That said, you wouldn't say someone picking nautilus top is trolling even though he picked the worst top laner right now.
General Esdeath 1 votesIf he went 
I would
archerno13 votesHello people?? What trolling? What griefing? Guy literally built everything he is supposed to as MF support
http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2549294535/205691626?tab=overview
He built Sightstone first, he placed most wards, he got first blood, he won his lane, he placed 7 control wards, he didnt die a lot, he did decent damage.
Hell if someone should be punished for griefing its OP with his 130 CS as mid laner in 33 mins (thats less than 4 CS per minute)...
General Esdeath 1 votesFirst time in ranked. First blood =/= winning lane, they lost outer turret and half the HP on inner before getting outer bot.
Watch the replay my dude, kinda hard to CS with a Kayn in your lane while fighting Zed (forces you to rush Zhonyas, so less mana) with WW flaming because nobody first picked Kayn for him. But please, keep assuming by end screen stats.
"He placed most wards" With a sightstone I would hope he did.
"He got first blood" OK...and? If I had a dollar for every first blood I got by just being the last hit/tick of ignite, I could buy myself a new skin.
"He placed 7 control wards" Yeah every time he stepped on a shroom he put one down, AFTER it detonated. Good job!
"He didn't die a lot" Well the assassins focused on the carries so...
"He did decent damage" I'd hope with an AOE ult like MF he would do decent damage while Zed shoves his Duskblade up my ass.
archerno11 votesFirst time in ranked. First blood =/= winning lane, they lost outer turret and half the HP on inner before getting outer bot.
Watch the replay my dude, kinda hard to CS with a Kayn in your lane while fighting Zed (forces you to rush Zhonyas, so less mana) with WW flaming because nobody first picked Kayn for him. But please, keep assuming by end screen stats.
"He placed most wards" With a sightstone I would hope he did.
"He got first blood" OK...and? If I had a dollar for every first blood I got by just being the last hit/tick of ignite, I could buy myself a new skin.
"He placed 7 control wards" Yeah every time he stepped on a shroom he put one down, AFTER it detonated. Good job!
"He didn't die a lot" Well the assassins focused on the carries so...
"He did decent damage" I'd hope with an AOE ult like MF he would do decent damage while Zed shoves his Duskblade up my ass.
U just said that its hard to CS with Kayn in your lane. You are Viktor... You should easily get 300 CS with 4 people on lane against u. Sorry , but while its true that most MF supports in lower ELOs are playing incorrectly, this guy is not. He played well. You guys just got beaten because enemy had gold lead due to their superior CSing on solo lanes.
Fact is, that guy didnt troll, he played properly , he built properly and losing game wasnt his fault.
And first timing champion in ranked is allowed. Its not trolling and Riot allows it
General Esdeath 1 votesYeah no, with a Zhonyas rush for Zed I got no mana. Unless Zed is just gonna sit there and not try to throw his unlimited energy based Q's at me.
I didn't say it's his fault, I blame the tilted WW who was flaming all game over nobody first picking Kayn for him lmao.
Xidphel2 votesNegative behavior/harassment
TheViper79111 votesThe categories are for riots internal use. They dont really matter to you. The automated review is the same in any case.
General Esdeath 1 votesGood point
GeminiRune1 votesTrolling is defined in many different ways. To your opinion, that is trolling. But that does not apply to everyone.
I could run 
in the bot lane with the intent to build 
in optimal order (whatever that is). Sure I can run with 
but you know I don't want to invest in a periodic situational summoner spell. I'd rather combat and/or track down.
If I were reported for trolling, what would be the trolling? The smite, the item build, or just the champion even if I explain my purpose? There's too many variables to account for and you, any other player, and probably even Riot cannot fully dictate what classifies it as a punishable option.
General Esdeath 1 votesDepends if you win or not :^)
No but seriously, I would think that you're trolling unless you said you were taking it to get cannons or counter jungle and take over their bot side jungle
DU Baymax1 votesExcept, what you described ISNT trolling, and also isn't reportable. unclench your butthole and try a little build variance once in awhile
General Esdeath 1 votesNo thanks I'm not trying to piss off other people for fun. My butt shall remain clenched.
DU Baymax1 voteslul