Apple disabled both Facebook and Google's iOS enterprise certificates because they were using them to collect data from external participants in violation of the ToS, although that wasn't the main app. And the access was restored once they took down the offending apps.

https://www.theverge.com/2019/1/31/18206020/apple-facebook-i...

If the violations were serious enough, I think Apple/Google would consider some kind of temporary shutdown for the Facebook app if they thought they could weather the PR storm.