The majority enjoys other people's suffering. And the majority would create an "Omg, i was banned for nothing, please pelase unban me, rito" post once banned.
I have been banned from the forums, and warned several times (last one today). I cannot write in the EUW forums because they banned me for a month. BUT, I have NEVER been warned nor banned ingame. I NEVER EVER EVER EVER flame in a game. Well, I got a restriction (deserved, I left it on purpose) because of leaving a game , tbh. But I'm not writting this because I'm toxic or want to be toxic without consequences. I just write this because it's common sense. Saying "Noob" is not permaban worthy, it doesnt matter how many times you say it, you dont need to be emmanuel kant to figure out that. And saying "noob" can make you permabanned if you are very high in the punishment ladder in this system.
EDIT: on the other hand, telling other people to commit suicide, and all that cancer and raping stuff are permaban worthy even if you get into it only once. Still, I've seen plenty of people bein that toxic, being reported and getting no punishment at all. It's simple, the machine learning algorithm just CANT make the difference, it's not a valid system, sorry.