chat restriction system sucks
let me say why. did you know that if you don't say a word through your whole chat restriction, it gets renewed because you didn't show an improvement in behavior? so muting everyone every game for your chat restrictions is not an option.
having 5 messages every 20 minutes doesn't help the fact either. imagine you're having a rough game. you have limited chat, and your team is sitting there raging at you calling you bad. you want to defend yourself right? but by the time you finally get to say something you're so frustrated that gasp it fits into the very broad spectrum of toxicity that riot has established. there's a report for ya. it could happen to you once every 5 games, and riot deems that enough to set you on another course of chat restrictions. the system is not meant to rehabilitate. it's meant to trap people. i've been off of my chat restriction for about 10 games now. and im really afraid that if i say anything that can be seen as toxic(casual smack talk is a good example, or even saying something along the lines of, stop dying please), i'll get reported by an overly sensitive player who has been throwing f-bombs at me himself, and i'll be tossed into another nearly endless cycle of chat restrictions.
when the tribunal was up(and i was a hell of a lot more toxic then than i am now) i rarely ever dealt with this. sure, i got restrictions. but i didn't get restriction after restriction after restriction after restriction. why not just give someone a temporary ban from the game itself if they're too toxic instead of limiting what is weeks of game time and raising the probability of losing due to lack of communication(pings only do so much, you know. and some people just ignore them outright)
tl;dr the spectrum for what is considered toxic is so massive, that most people who play this game could get chat restrictions if people are vindictive enough.