https://www.cnet.com/news/apple-blocks-googles-internal-apps-on-ios-devices/

The company sidestepped the App Store and took advantage of Apple's developer enterprise program, which is designed to let companies internally distribute apps, according to TechCrunch. In response to the report, Google said it's shutting down the app on iOS devices.

But that move did little to placate Apple, which presumably revoked Google's certificate for violating its terms. That means that apps Google was distributing to employees internally, including beta versions of products, stopped working. Those include early versions of Google Maps, Hangouts, Gmail, as well as apps for Google's buses and cafe, according to The Verge, which reported the news earlier Thursday.