Those users would always be there. If there was another App Store instead they would be there. If there were app stores competing there would be users with doll

Those users would always be there. If there was another App Store instead they would be there. If there were app stores competing there would be users with dollars to spend on both. The App Store doesn't provide users because it does something special, it provides them because there is no other option to install apps on your expensive smart phone/tablet without using it.