Unfortunately no part of the internet is a public venue. There is no internet street corner, no "common carrier" internet phone company, no internet post office. Everything you do is subject to the whims of shareholder value. If tomorrow enough people decided left-handed people are the scum of the earth to affect Youtube's bottom line you'd start seeing left-handed videos demonetized. If enough people decided left-handed people don't deserve a voice to make a racket with their hosting providers and registars you'd see left-handed communities purged from the internet with no legal recourse whatsoever. In the real world that's only happened to Nazis and terrorists but I suspect we'll see it expanding as people realize the power an angry mob can wield.

It's a bit fascinating that media which attempts to censor this content seems to have worse problems with it than media which doesn't. There's nothing illegal about sending Nazi content through the mail but the mail isn't utterly swamped with Nazi newsletters but places like video games seem to fight an endless battle to keep half their users from turning racist.