In face of the recent porn bot wave hitting mastodon.social and now mastodon.top, registrations for accounts on our instance now need manual approval during hours when the server is not actively monitored (i.e. night hours).
#mastodon has powerful tools to control and moderate server activity. I’m surprised that both mega-instances mentioned above don’t use them.
Let’s hope that these porn bots soon loose interest in the #fediverse (ok, this is probably unrealistic).