Let's get this straight: When a social network bans you based on your political views, IT IS censorship and IT IS a violation of the right to freedom of speech. It doesn't matter that they're a "private" company. They have power to block dissenting opinions from participation in a public forum. What it's not is a violation of the First Amendment, which only the US government can do.
People who claim that it can't be censorship if it isn't the government are spreading fake news.