https://techcrunch.com/2020/05/26/apple-fixes-bug-that-stopped-ios-apps-from-opening/

Apple has now resolved the bug that was plaguing iPhone and iPad apps over the weekend, causing some apps to not launch at all. The issue was related to a bug with Apple’s Family Sharing system, it appears, as users reported error messages which said “This app is no longer shared with you,” and directed them to buy the app from the App Store in order to still use it.

Following this issue, users on Sunday said they were seeing dozens of pending app updates for their iOS devices, some of which even went back to the app’s last update from well over a week ago. Users reported in forums seeing as many as 10, 20, 50 or even 100-plus new updates to install. This indicated a fix was in the works, as these were not brand-new updates — the apps were already up to date. Instead, these reissued updates seem to have been part of the fix for the Family Sharing problem, as afterward the bug was resolved.