It would be better if you could just ignore them.

In general this Lemmy architecture, presented as compromise, where instance admins have some power and defederation is a thing - I don't like it. I understand it's simpler to do, but socially it may just not be something that will work.

IMHO user identities should be cryptographic, so should be community identities, and moderation should be done the same way as certificate revocation, and providing storage and connectivity shouldn't be connected to moderation or identities.