My opinion on this is to preemptively defederate as Meta has proven itself time and again to be a bad actor; they have proven willing manipulate their feeds and algorithms to induce rage based engagement and even though they wouldn’t be in control of the fediverse, they will still at the very least try to heavily influence it. If the fediverse wasn’t a possible threat to them, they wouldn’t have created an app for it and made current fediverse operators sign NDAs. Additionally, if we are complacent, they could start creating Lemmy style fediverse communities to gain control of that aspect of the fediverse as well.