I’m as leftist as they come but I think it’s their prerogative to defederate from any instance they want. If you and/or your content are not welcome there you should respect that. It would be kind of authoritarian otherwise, wouldn’t it?
Censorship is not what’s happening, because you’re always free to express yourself in countless other spaces if you want. That does not mean that they’re are forced to read what you say.
They can exploit the impulses of some vulnerable people.