https://www.cnet.com/news/facebook-pulls-its-onavo-security-app-from-apple-app-store/

Apple officials told Facebook last week that Onavo violated the company's policies on data collection by developers and suggested Facebook voluntary remove the app, The Wall Street Journal reported Wednesday. The app, which bills itself as a way to "keep you and your data safe," had been available for free download from the App Store for years.

The app, which Facebook acquired with its 2013 purchase of Israeli-based mobile analytics startup Onavo, provides users with a VPN, or virtual private network, to help them stay secure online and keep their browser history from malicious websites and bad actors. But when you download Onavo, you give the app permission to share data about what you do on your phone with Facebook.