That's because Mastodon or any other federated social network hasn't taken off, and so not enough development has gone into them. If they take off, naturally pe

That's because Mastodon or any other federated social network hasn't taken off, and so not enough development has gone into them. If they take off, naturally people will develop analogs of spam lists and SpamAssassin etc for such systems, which will cut down moderation time significantly. I run an org email server, and don't exactly do any thing besides installing such automated tools. On Mastodon, admins will just have to do the additional work to make sure new accounts are not posting weird stuff.