Apple's TOS surrounding this change prevent any sort of content-gating of this sort. Infractions may result in removal from the app store.
I dislike Apples closed ecosystem (anf google trying to do the same), but if it can weaken FB's grip on people, it might bring some benefit even to non apple customers.
https://finance.yahoo.com/news/apple-hits-back-facebook-revo...
https://blog.malwarebytes.com/security-world/2019/01/apple-p...