@homegrown just seen another one in this thread.
Also now seeing instance swapping: intially they were all on mastodon.social 'Mercyjohn' has now appeared from 3 instances advertising the same spam.
So it's now whack-a-mole on any server that doesn't vet sign ups, though I foresee that if we all started to vet the spammers would simply develop strategies, probably using AI, for that and it would become about as effective as having a catchpa.