The walled garden isn't some impenetrable fortress, though. It does allow quality control and that is shown time again and easily seen when you compare the Appl

The walled garden isn't some impenetrable fortress, though. It does allow quality control and that is shown time again and easily seen when you compare the Apple App Store against the Google Play store, for example. All Apple is verifying, though, is that the app is coming from who it says it's coming from. It's these companies themselves that are selling the data to third-party companies. Unless Apple can someone predict and detect this reliably for every app, the onus of responsibility should be on the companies and their developers, not on Apple.