In ranked or draft a player can ban another's champ or champs because they feel so? They're taking away others agency to pick those champs
In ranked or draft a player can pick another's champ before them taking away their agency.
Yes that is possible, but it does not make it right.
A) you are a horrible teemo player you know this, and every game you go into is either you being carried or a loss
Yes that is a problem, that shows intent. You know its a problem yet you keep doing it :D
B) Your team has the right to report you, regardless of reasoning. For all we know you could be flaming/trolling/afking/feeding in all these 100 games
Regardless of whether or not the person is a bad teemo player or a good teemo player, makes no difference. That's what the ranking / mmr system is for, to determine what tier a player will end up. For all you know they could just be a teemo main that likes to play teemo as the bot lane carry. He is a marksman after all, and can build ad or ap.
So no, the team has the capability to report, but they do not have the right as established by the game rules and guidelines set forth from Riot. And you are using suppositions to pre-determine the guilt already of said teemo player -- i.e. "he's probably a feeder/troll/afker" etc. That's the problem with so many players in league, you automatically assume someone is one of those things when they play something contrary to your expectations. You have no right to make that determination about any other player, and even if they were to do bad in your game, still does not give you the right to report them; for all you know they could have an 80% winrate on teemo adc and just had a bad game.
C) Being bad isn't punishable, but trolling is
Correct, and 'trolling' as defined by Riot, is when someone plays with the purpose of losing through various means.
Let's play a little game of "trolling / not trolling. Ready? Also in these examples, you are playing in the game as well:
Teemo ADC, plays to win (wins the game): Trolling / Not Trolling?
Teemo ADC, plays to win (loses the game): Trolling / Not Trolling?
Teemo ADC, plays to win, goes 0-10 but wins the game: Trolling / Not Trolling?
Teemo ADC, plays to win, goes 10-0 but loses the game: Trolling / Not Trolling?
Teemo ADC, hides in lane bushes and has a bad CS score: Trolling / Not Trolling?
Teemo Jungle: Trolling / Not Trolling?
Teemo Support: Trolling / Not Trolling?
Teemo Support: Doesn't buy sightstone but uses shrooms post-6 for vision: Trolling / Not Trolling?
Teemo Support: Doesn't buy sightstone, has smite spell, and counter-jungles enemy bot side when possible: Trolling / Not Trolling?
Teemo Support: Kills enemy champions during ganks/etc with spells/ignite: Trolling / Not Trolling?