Did you know that only Walmart is allowed to build stores on Walmart-owned land? And that they pick and choose what products are sold on that land? That's clearly an abuse of their monopoly on stores built on their land!
Google's app store is NOT comparable to "just any other store" because it is a quasi monopoly, which was my point in the first place. Therefore different rules (should) apply. How are you not getting this?
Well... if walmart was by vast majority the only store present in any town and the vast majority of people are only able to shop there, it would of course be a problem too and would need regulation just the same.