I believe iOS14 has features to detect this: https://www.reddit.com/r/apple/comments/hejb9i/ios14_catches...
How are we supposed to know if the app's continuous request for clipboard access is ok or not?
I feel like that was literally the only value-add in the App Store review process and the fact that its a feature in iOS seems to indicate that Apple is throwing in the towel here and saying "we don't know if this is a privacy issue or not so we will just notify you about it".