She’s apparently a MAGA supporter, so I have no sympathy.

Doesn’t Peertube already do this?

The great thing about Lemmy though is that a community you interact with or even moderate doesn’t need to be on your instance. If you’re a member of Beehaw, which doesn’t allow community creation, you could start your Dune community on Lemmy.ml or another instance and moderate it with your Beehaw account.