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 more discussion around 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: “If we’re going to have an effective strategy against FB/Meta, we should clear up some misconceptions around defederation”

It’s not as simple as “that instance is a traitor”, and attacking other users/admins over this without considering the nuance is silly. For example, lemmy.ca has blocked Threads, but I’m not going to go around attacking others over a decision that’s based on how each of us is predicting the future of the Fediverse to play out.