In at least one case: Then, with Mobicip’s deadline just a few days away, Apple responded three times to his earlier detailed questions — with virtually the same message: “Your app uses public A.P.I.s in an unapproved manner, which does not comply with guideline 2.5.1 of the App Store Review Guidelines.”

And is that respectful of the AppStore rules? I’m not sure people realize that App that provide system wide functionality using borderline workaround are only one step away from becoming straight spyware.

But again can’t read article so I might be wrong.

The Accessibility API on iOS cannot block opening apps to my knowledge, and using undocumented APIs are a pretty good way to get removed from the App Store immediately as opposed to with a warning to change your app to "comply".