https://www.theregister.co.uk/2018/08/23/onavo_vpn_pulled_from_ios/

Facebook has pulled its data-snaffling Onavo VPN from Apple's App Store after the iGiant said the tech violated recently tightened rules.

Onavo is a free VPN app that pipes user traffic through Facebook systems under the pretext of protecting surfers from malware-tainted websites and other threats. The app, which the social network acquired in 2013, sends users' data back to Facebook, even when the app is turned off.