You can actually pitch a fit when the entity poses a genuine existential crisis. What do you think Meta will do once they're here? Give direct access to Facebook users. This will drown out the user base AND pull users away when certain features are introduced by them that just happen to not work well outside Threads. It is an EEE strategy in your face and you want to wait and see? Come on.

I don't think defederating from any Instance which plays ball with Threads for that reason only is a good idea. I do think Instance owners should see the danger Threads poses and act accordingly.