At least one lemmy.world admin accepted an off the record meeting with meta, and they won't tell you about it.

https://lemmy.dbzer0.com/post/599489

The answer to this scenario built into the fediverse. You bail on the bad instance and move to a new one. If the problem of profile transfers can be solved, then the whole thing becomes fairly trivial.
Does profile transfer even matter?
It does if you want to migrate your favorites and subscriptions.
GitHub - CMahaff/lasim: Move your Lemmy settings from one account to another

Move your Lemmy settings from one account to another - CMahaff/lasim

GitHub
I think it does, others may not think it does.