Do you go to twitter when you need an opinion on your back surgery? Or how to fix a broken tool? Or if your symptoms are covid19 or not?
They are not an arbiter of truth or an authority.
OP and myself are making the case that, by dipping into politics and labelling certain opinions, rhetoric and/or factual claims as "unacceptable", they're making themselves exactly that.
Websites are moderated all the time - that doesn't make them arbiters of truth. I fail to see the actual argument.