So only install apps from the Apple App Store then. How do other app stores where developers aren't forced to play by those Apple rules affect you then?
But these evil dangerous apps wouldn't have been allowed by Apple in the first place, so they'd never have been on their app store to begin with.
Or, IOW: You can't do that after Apple bans them from their store either. Apps getting banned from there so you can't download them is a thing that actually exists in the here and now.