I’m pretty sure that would not be in Meta’s best interest, from their point of view. After all, Meta is all about harvesting your personal data. I believe whether to federate or not will come down to how egregious the federation terms are that Meta will propose because you know they will want to access user data in some fashion for their own profit. If they want the same kind of data from the Fediverse as they get from their native app, the answer will be a resounding “no”. If they ask for even 20% of that data, the answer will remain the same.