For what it’s worth, it doesn’t realistically change much since Lemmy (software) doesn’t federate with Threads in any meaningful way. There are some benefits, but my understanding is that the benefits are mostly symbolic. This is also why you might see a lot of Mastodon instances staying federated with Threads, because there are tangible benefits and drawbacks to that decision.

As for WHY an instance might want to stay Federated, see some discussion from this other thread here: https://lemmy.ca/post/11771031

It’s not as simple as “that instance is a traitor”, and attacking other users/admins over this without considering the nuance is silly.