Most cases of bans or chat restriction are based on a group of players ganging up on one player who is having a bad game. In a game where 5-10 players are displaying behavior below summoners code standards, it's a joke to ban one.
That's not how the system works. 1 report = 9 reports, as confirmed numerous times (including with actual snippets of the code!)
On an account that has been punished before, the bar for how negative someone can be before the next punishment is reduced, because it's a decision to continue on a path after being specifically warned against it.
