EDIT: dbzer0 had nothing to do with this ban, it was done by a Lemmy.World admin.
~~I updated my post after another user stated that it wasn't lemmy.world admins that performed the ban but the db0 team that did. I can't say with certainty that's actually the case since the modlog is pretty opaque and I don't have full knowledge of how [federated] actions are propagated & displayed.~~
~~I (incorrectly?) assumed since those communities had existed for so long on the dbzer0 instance they had at least tacit approval from the admins there and were in communication with them enough that a full ban wouldn't occur -- when I saw the removal in the modlog I didn't even consider that possibility.~~
~~Sorry for kicking up drama here if the Lemmy.World team had no part in this :(~~