https://www.theguardian.com/technology/2018/jun/13/apple-facebook-privacy-data-harvesting-onavo-app-store

Rules appear to target services like Onavo Protect, which claims to protect user data even as it feeds information to Facebook

Apple has updated its rules to restrict app developers’ ability to harvest data from mobile phones, which could be bad news for a Facebook-owned data security app called Onavo Protect.