Earlier quoted context omitted.
Bandcamp is using their own billing system, bypassing Google's cut. Every app could do this and cut Google out all together. An app could just let you download the app, pay some amount when you're in the app which would unlock the functionality. I don't think its unreasonable for Google to have a problem with this. They want to get the reach of the app store, and make money off it, without paying a cut to the host li…
In the 80s and 90s you could buy software running on Windows, where the vendor of the software didn't pay anything to Microsoft; in fact, I'm sure Microsoft was happy with them supporting and increasing the strength of their platform. Why does this have to change now? Why does the platform need a cut?
To meet shareholder expectations of continuous growth.