Chat banns such a mistake for design.
So Would it not be a better choice to flesh out the system more? like im a person by nature that I love even games and when it is a close game im humble and pleased win or loss and say good game cuz it was just that but if its a stomp yeah im going to say bg cuz realistically it wasnt a "good game" and ill even point out there flaws and say why we lost or they won.
Now I 100% never talk shit or put down my own team i try raise there morale and help then un tilt so if I get chat banned cuz the enemy is cocky and pissed off about what ever and report me like sometimes if you report someone for a real reason they report you back for no reason just cuz there pissed off so then since im chat banned i cant help my team and reply to them and possibly get reported again for refusing to communicate cuz i cant reply to there important statement or help them with item buying like if the adc needed a crucible id like to let them know but i cant help my team and im more of a hindorance.
I think they should flesh it out more to look at if the reports are from the enemy team or your team and ban you either a /all chat or team chat.
Btw on a subnote why do we even have all chat in a very very competitive game. that breeds toxicity right there.