Smartphones are not stand alone widgets. They are portals into vast troves of software made by legions of developers. Right now, at least for Apple, their app store is the lone chokepoint between this software and the world. Them taking 30% of every sale between the developers and their users deserves scrutiny. This percentage is not based on the market because there is no market. There is one option. There lies the monopoly.
To spell this out further: There is competition in the smartphone market... but the app store has an artificial monopoly on iOS software distribution which is a separate market serving more than 100 million people.
