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.
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.