I'm going to butt in here. Because, OP has made several posts and wants an answer, which is understandable. As one of the people in one of the matches you were reported for, I'll explain my reasons for doing so.
After 3k+ aram games, I've reported less than 10 people for reasons other than afk. This was one of those rare situations where I'd go through the trouble to complain.
In your Victor game, you purposely choose Victor instead of Rengar from the reroll table. No biggie. But you didn't leave the pad until 3:53 minutes into the game. At 8:50, you basically went afk, chose to sit two turrets behind, and when enemy rolled in you died. As others have posted, one might chalk this up to dc, going to the bathroom, some inconvenience, I'll explain why it wasn't, because I was curious and went back to replay. Victor gets prototype hex core, but you bought pots at 0:10, which means you weren't late getting into the game. You moved your mouse at 0:53, waited until 3:53 because you wanted better gear to start off. Ok fine it happens. The problem is that even when you get the gear and the team is off to a bad start from a 4v5, you decide to just make an occasional hit to get the assist, then fall back into bush behind turret in the middle of a team fight we were winning. Then you take the chance to clean up kills or assists, and it's never a situation where you're an assassin trying to ambush.
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If you check the damage charts, I did want not contribute that much to the team and waited in brush for most of the game, as Udyr is not a very good champion in ARAM.
Ok some people play this way. They are unfamiliar with the champ or a champ that isn't well regarded for a certain mode. The problem is that this is an inconsistent statement. After the match, I spectated at least 3 of your other matches and looked at your match history. This type of behavior is a pattern. It's not just with champions you're unfamiliar or dislike with. Any time the the enemy team has a favorable team comp with hard poke, you basically roll over and don't participate. The matches you faced veigar a lux as a tank or fighter are good examples. You fight in so far as to not violate the letter of the summoner's code but still break it in spirit.
When the team has a favorable comp and more specifically you have a good poke champ, you go balls to the wall (your lux and ziggs match). You dive like crazy, and expect your team to tank and other players to back you up. You repeatedly ping the team tanks to help screen for you. Yet, when the shoe is on the other foot, you basically roll over, and end up having 1/5 the damage of the team support. When you play tanks, you basically sit behind turret and watch team get mowed down only popping out to make sure you get an assist if there's a chance. The exception is if there's a good team comp, you'll tank. Otherwise, you don't.
As someone who almost exclusively runs AP Reksai, AD ahri, etc... and multiple other weird off builds (in ARAM) because its often fun, I have no problem with someone being unfamiliar with a champ or doing weird builds. But they have to at least try to win.
The problem is that despite whatever excuses you provide, you clearly expect others to behave a certain way and don't do so yourself. You do the minimum to abide by the letter when team comps aren't in your favor to avoid an explicit feeding report, yet still do so implicitly. That was my evidence to Riot and they seemed to agree with me and the others who made the report.