I also disapprove of any chat restriction. I believe this will be the nail in the coffin for an already small pvp community. The toxicity is awful, but there are some things that could be better implemented to help achieve a better goal of this.

Give us a better introduction to new people to pvp skills.
Give us a better mentoring system so we can work hands on with those who wish to learn.
Give us a better matchmaking system that doesn't match people of such vast skill differences together. (it is better this season but still has its issues)

SE, you are going about this in the wrong way. Censoring people is just a band aid. Help us help the community better. The current "pvp mentor" status is too much of a joke.