That's a gross characterization of what's going on. When I download Uber on App Store, the business relationship is between me and Uber (and Apple doesnt and shouldnt come into the picture).
Do you think Ford needs to get a cut if a user buys Michelin tyres of their Ford Car? Will you argue that Michelin needs to "pay into Ford for access to their market"?
Do you think Ford needs to get a cut if a user buys Michelin tyres of their Ford Car? Will you argue that Michelin needs to "pay into Ford for access to their market"?