Not at all. But I would like to see legislation (or some strong rule) that forces huge corporations or companies over a certain market share to host all legal content.

Similar to how television broadcasters have regulations that that force them to provide equal time to all major candidates.

I think there’s some reasonable threshold that doesn’t require small providers to host everything.

Equal time for TV hasn’t been a thing for decades. And it was justified because TVs used the public airwaves. I don’t know how you could write a law that would pass constitutional muster. And it seems very unlikely that you could get a constitutional amendment through on this topic.

Yes. Any company with an user base or influence above a certain threshold should not get to make moderation decisions unilaterally without the input of society at large. That input is called "the law".