[btown]

Very possibly just that it is an ID that is no longer on the App Store - in Flappy’s case because the developer was frustrated with the demands being placed on him by all of the app’s global users (it was a sad story at the time). But a security provider wouldn’t be wrong to assume that the majority of times an app is removed from the App Store it is because it was found by Apple to violate policy in some way - and why introduce the liability of having a whitelist for things like Flappy Bird?