I believe that Twitch has too much power/authority, but also I believe that it's reasonable to moderate speech in communities and platforms.
That said, I believe there's a material difference between examples and what was shared in the parent comment. I don't think one can generalize from "speech calling for violence should be removed from Twitch" to "all unpopular opinions will be suppressed". Yes, it was unpopular (and career limiting) to stand up for LGTBQ+ folks, and those voices rarely got mainstream airtime. Suppressing those voices was wrong, but totally different than prohibiting endorsements of mass violence.
I believe we, culturally, can evaluate the difference between "I think gay folks should have equal rights" and "America deserved 9/11" and understand why we should be open to the former and cautious about the latter.