https://techcrunch.com/2019/01/30/apple-bans-facebook-vpn/

In the wake of TechCrunch’s investigation yesterday, Apple blocked Facebook’s Research VPN app before the social network could voluntarily shut it down. The Research app asked users for root network access to all data passing through their phone in exchange for $20 per month. Apple tells TechCrunch that yesterday evening it revoked the Enterprise Certificate that allows Facebook to distribute the Research app without going through the App Store.

TechCrunch had reported that Facebook was breaking Apple’s policy that the Enterprise system is only for distributing internal corporate apps to employees, not paid external testers. That was actually before Facebook released a statement last night saying that it had shut down the iOS version of the Research program without mentioning that it was forced by Apple to do so.