I want a free speech platform that allows any content from humans or bots, from any political leaning from anarchism to fascism. What’s the most mainstream platform that puts free speech first? I can only think of Rumble. There are some federated instances but they are usually small.
4chan? I don’t know if it’s still around. I’d guess nobody except a clinically psychotic dude locked up in a basement with nothing just a computer would read a forum like that though.
I know someone who has gotten temp banned from 4chan for their speech repeatedly, so it doesn’t seem to fit what OP is asking for imo.