This is illegal.
“This is illegal.”
No.
“This is illegal.”
No, it’s not.
Not hardly. It’s a privately owned forum. It’s legal for the owner and administrator to censor, just as Jim can zot leftards off of Freep, and a football team owner can fire a player for taking a knee on the field, and Roseanne could lose her sitcom over a tweet. She had contractual clauses she could have used to push back, but chose not to. But that’s contractual, not free speech. First Amendment only applies to government action against speech.