A monopoly is not defined as a 100% market share though. I'd argue the playstore is the way to distribute apps on android, and realistically a monopoly. Wether

A monopoly is not defined as a 100% market share though. I'd argue the playstore is the way to distribute apps on android, and realistically a monopoly. Wether or not the "software distribution" and "payments processing" aspects of the playstore are separate markets/products is (in my mind) up for debate. If they were then google would be using it's distribution market penetration to push its payment processing business. Then there's the argument that the way they selectively seem to cut off smalltime donation-based software does harm users overall, although it is a systemic harm, not individual, or at least that would be (as you said) very hard to prove.