Do you suffer from some kind of God complex? People other than you will make their own decisions on how to conduct their own life and business. Even if you don't agree with those decisions.
Why you don't seem to understand how it works in any other industry?
I'm building a house, I'm going to buy the floor at shop B and the walls at shop A because it's a better value.
I want to buy some groceries, I can buy bread at shop A and eggs at shop B.
When you're on mobile you buy everything either at the play store or the appstore depending on your phone, that's it, zero choice, it's either everything in one or the other.
So first a grand total of two stores for the entire world isn't going cut it regardless and then those stores don't even compete with each other anyways because you are locked in to just one with your phone.
Is that any clearer now why it's not a market or still not?