No, all links to a variety of Mastodon servers, plus official Mastodon account, plus hashtags mentioning Mastodon... were banned.

No idea if they still are. I don't hang out on Twitter. But sheesh.

It was any server that shared links with the server which hosted that. So mathstodon.xyz, for example, which is where a bunch of math Twitter ran to, and not particularly political, was also hit. Even if you endorse banning links to someone sharing public information, it was an extremely broad brush.