I think you're severely misunderstanding how bad RIOT's ban system is currently.
My games consist of "gg", "ty", "have a nice day" and yet I consistently get reported if our team loses. I currently have a 75 game restriction... why? I don't know. I put in a support ticket asking exactly this and all RIOT can tell me is that I "harassing your teammates to gank for you, complaining in chat, blaming your team for not following your call"
I truly don't know where this comes into play. If I ask my jg to gank and ping a few times cause I'm getting pushed under tower is that "harassing"? If I complain that Riot really needs to understand that basic math is that 3>2 and the game should have ended does that make me toxic when we're down 20+ kills? Does saying "hey you guys probably shouldn't have walked down mid 1 at a time into a 1v5" means I'm blaming them and why would that be a bad thing if they ARE to blame?
It's not so simple. There are outliers to any statistical system and inappropriate measures take throughout ANY justice system. At current there is NO rulelist, NO list of banned phrases, NO ability to appeal (because RIOT support specifically says they do not remove ANY chat restriction or ban) and no form for the community (because we've been under maintenance for months) to contribute to the selection process.
Sorry, but people like you need to get off their high horse and realize that free speech and communication on every level shouldn't be censored. I agree that there should be a penalty when people are horrible (and yes there's a great many people out there doing it) but to suggest that people aren't being banned improperly is just ignorant.
I've asked RIOT support to provide specific details as I cannot, and I'm certain they cannot come up with a good example, find anything in my chat logs that warrant 75 games restricted.
Check out one I got reported for which lead to a restriction:
Ih8ucuzurtoxic: all good, it's bots. we can have a tea party at nexus and still win
Ih8ucuzurtoxic: great play
Ih8ucuzurtoxic: u2
Ih8ucuzurtoxic: damn minions (i died cuz I had a huge wave push mid inhib and couldn't run around them fast enough)
Ih8ucuzurtoxic: great game
Ih8ucuzurtoxic: fun times
Ih8ucuzurtoxic: plz honor
If you can find out where that was an example of:
Cheat
Flame
Troll
Leave
Please explain it to me, cause I don't fucking get it.