So who should be? Facebook? Google? Microsoft? Adobe? Disney? Samsung?
How many APIs and app packaging do you think app developers would bother working with?
How much time do you think it would take for the network effect to desertify all-but-one?
Given the only incentive for these stores would be user monetization, how long would it take for the winner to make confetti out of your privacy?
If Apple's strategy is "Privacy is a luxury item we embed in our products", how would breaking Apple's monopoly on Apple's products affect Privacy?