Fedi admins, please switch off instant signups! 🙏
You can do this at Preferences > Administration > Server Settings > Registrations > Who Can Sign Up, change to "approval required for signup", tick box marked "require a reason", save changes.
If you allow instant signups, you are opening your server to spammers, causing headaches for hundreds of other servers who all have to block your spammers. The latest wave of spam is *all* from servers that have instant signups!
@homegrown can't emphasize that enough. Thanks for bringing this topic up.