We're currently facing a distributed network of bots creating accounts on our platform, so we've completely disabled registrations until we can better prevent this.
@write_as had the same problem, albeit at a smaller scale, on littr.me . I wonder if spammers are diversifying their targeting on to smaller activitypub services. :)
(By "smaller" I meant littr.me, not write.as :D)
Managed to isolate the abusive actors. Disabled the many thousands of spambot accounts created. Signups are open again!