What's great is I can easily swap to an instance that is federating!
Unidirectional federation sounds like a nightmare on the UX side, so if that's the case I imagine it'd be Threads to Mastodon, enabling you to follow (but not interact) with Threads users.
> What's great is I can easily swap to an instance that is federating!
Define swap. I'm hearing instances which federate with FB will be defederated as well. If instances need to be federated to "swap", it likely won't be easy.