Yes.

The problem is that sh.itjust.works has an open-registration policy. So when Beehaw.org banned a user, they just made user2@sh.itjust.works and then user3@sh.itjustworks (etc. etc.) and Beehaw.org kept getting flooded with dick-pic spam.

The underlying question is one of open-registration vs closed-registration. Furthermore, its compounded by the fact that Mastodon-like moderation tools don't exist yet (Lemmy is much newer), so solutions from Mastodon don't exist yet.

It sounds like Beehaw.org is pretty confident that Mastodon-like moderation tools will allow them to open back up.