https://www.theregister.co.uk/2019/02/01/apple_facebook_google_enterprise_cert_drama/

Analysis After briefly punishing Facebook and Google for violating the rules of its enterprise developer program, Apple has relented. Cupertino is in the process of restoring the digital certificates used by Facebook and Google to sign and distribute in-house iOS apps internally to employees, after revoking them within the past 24 hours.

The iPhone maker invalidated Facebook's enterprise app certificate earlier this week after the ad biz admitted using using Apple's enterprise program to bypass the consumer app approval process of its public App Store, and distribute its data-harvesting Facebook Research app directly to teens and adults. The enterprise program allows companies to digitally sign their own custom iOS and macOS apps, and hand them to employees for internal use and development.