This is such obvious nonsense that it can only be described as an article of faith, not a reasoned position. If rival app stores - ones that had different editorial standards and different payment policies - existed, *the only people who could possibly use them are Apple customers*. Android users won't be using an alternative iOS store. *Symbian* users aren't going to be installing apps from an iOS store offered by someone other than Apple.
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If it's true that "Apple customers don't want non-Apple app stores," then Apple wouldn't need to use technological countermeasures and legal threats to prevent them from coming into existence. These non-Apple app stores would fail on their own terms.
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