https://www.cnbc.com/2019/01/30/apple-says-facebook-violated-its-policies-with-its-research-app.html

Apple has revoked some developer privileges from Facebook following a TechCrunch report Tuesday that said Facebook was paying some users, including teenagers, to download an app that provided a deep level of access to activity on a user's phone.

An Apple spokesperson told CNBC Wednesday morning that Facebook violated its policies by distributing "a data-collecting app to consumers." Apple has revoked Facebook's "enterprise certificates" that let it distribute the activity-tracking app to users.