If Apple's interfaces aren't fundamentally exploitative then I don't see how it's unreasonable to let Meta interoperate with them. As long as the user opts into it deliberately, Apple has no right to obstruct their business.

Personally, I don't trust Meta as far as I can throw them but it's my phone so I know I can make the call. I want interoperability to be forced so that iOS and Mac customers can finally use alternatives to Apple's unnecessarily opaque, expensive and untrustworthy services.

Competition will do good here. Apple needs to fix their infrastructure if they're unable to safely let competitors integrate with iOS and Mac platforms.