That said, I'm worried that Meta will only choose to federate with a whitelist of ActivityPub instances, which would certainly be a long term harm to the Fediverse. Maybe they'll prove me wrong though. Zuck is more philosophical than people give him credit for, and I think he's aware of the mistakes he made that caused people to lose trust in Meta. He has an opportunity to embrace (for better or worse) federation as a way to distinguish Meta from its increasingly centralized peers.
It's also an opportunity to expose the disingenuity of Musk, who ironically promised to "turn the platform into 'something new that’s decentralized" [0] but is now suing Meta for making a product that more closely resembles that description than does Musk's recent behavior of view limits and auth walls.
[0] https://www.wired.com/story/twitter-had-a-plan-to-fix-social...
Most celebrities didn't need to be paid to get an email address.
Having corporations participate to fediverse will only be a bad thing, apart from some short term gains.