Perhaps an additional requirement is good marketing from the App Store company. Apple aggressively markets the iPhone App Store. I don't see Google doing the

Perhaps an additional requirement is good marketing from the App Store company. Apple aggressively markets the iPhone App Store. I don't see Google doing the same. iPhone Apps are a big success because they are "top of mind" for the general population. Android apps, not so much. I am sure most people have no idea what Android is or that there is an app market for it.