My satellite TV provider has an app I can only use if signed up to them. Do they now need to offer TV subscription through their app? What about the 37signals Campfire clients? Do they now need to offer Campfire subs via inapp purchase too?
They could offer their subscription on their web site and collect 100%. Their app would then be required to offer the same subscription deal as an in-app purchase for the same-or-lower price, and then they would collect 70%. The app could not refer users to their web site for purchases.