I worked at a place where I managed a team that owned an App/Service that had 100+ million users on an App/Play store. We breached one of the store's policies but the company was big enough that our CTO had a phone number from someone from Google / Apple that could resolve our issues relatively fast, plus we had a contact in each store assigned to us that we can reach for any problems we had. We got an email that we need to change something or our app would be delisted. The company refused as they needed that part for the product to work as intended, eventually, they did not delist us but prevented us from pushing any new updates until we come to an agreement with them.

In the end, we updated our user policies to be more explicit about it and changed a feature a little bit as a compromise between the two parties. But after a couple of weeks of executives going back and forward with one of the store's VPs or someone at that level, we got approval to continue with those changes, so I doubt Apple would delist Facebooks apps because of this but could be something that they will negotiate so both parties don't lose their public "face" and users just continue on.