Banning players is (mostly) an awful business strategy/solution
Death threats and intentional feeding ought to be the only bannable offenses. Many players invested hard-earned money into the game; it's damning to ban them and force them to practically get on their knees and beg. In a competitive genre like a MOBA, trash-talking is often much of the fun. If someone is so easily offended/tilted by someone saying "ez," then perhaps this isn't the genre for them. Chat's hardly ever regulated in FPS; though I'm not that great, it's refreshing knowing I can talk shit or at least defend myself against another rambunctious individual. It's sort of like hitting a pillow, although that hardly works for anyone, and most of us would rather keep the violence to words rather than rehearsing its physical form.
Anyway, what's the point? For all the pseudo-therapy you play (lmao, you honestly believe banning someone in a game will reform their personality) you sure miss the mark. All that does is anger the player even more. And since you revamped the leveling system to the point where everyone's on equal footing at summoner level 1 in terms of stats, you've only fostered more smurf accounts to hijack themselves into new games and ruin experiences for newer players who'd have otherwise been interested in investing into this game.
I've played this game since season 3. I sucked, but the game was a hell lot more fun. Toxic players didn't hinder me because I'm a competitive individual. I strove to improve mechanically and learn more game knowledge. The focus shouldn't be on moderating what's said within the community, but improving the game dynamics itself, and proper balance.