https://wccftech.com/ios-13-5-app-store-bug-blocking-some-users-from-opening-certain-apps/

A few days ago, Apple saw fit to release its latest iOS 13.5 and iPadOS 13.5 update to all users. However, for some users, the update is not allowing them to open certain apps like YouTube, prompting them with an error that reads “This app is no longer shared with you. To use it, you mush buy it from the App Store.” Users don't have much on their disposal as they can either cancel the prompt or View in App Store. Are you experiencing the same iOS 13.5 App Store issue?

As mentioned earlier, some users have been unable to open certain apps like YouTube and WhatsApp after updating their iPhone to iOS 13.5. Take note that only certain apps are being affected and probably the App Store issue has something to do with iCloud Family Sharing. Possibly, Apple's mechanism to prevent users from installing duplicate apps might be the reason for the issue.