Just fwiw, my understanding is that this has already happened on both Android and iOS (via TestFlight): https://techcrunch.com/2019/01/29/facebook-project-atlas/
Also worth noting that they got called out and ultimately shut down for being shady. Even though they were operating outside of Apples locked down environment. It's almost like we don't need Apple to protect us, and in fact we can protect ourselves
https://www.eff.org/deeplinks/2025/06/protect-yourself-metas...