https://www.siliconvalley.com/2019/01/31/apple-blocks-google-from-using-internal-ios-apps/

Apple widened its privacy feud with tech giants on Thursday as it blocked Google from running its internally built iOS apps, an apparent response to the search company’s violation of Apple’s developer terms.

The decision follows reports that Google had been running a voluntary program, similar to Facebook’s, that offered money to participants who installed an app on their phones allowing Google to monitor their activities.