Who should determine the margins a store owner charges if not the store owner?
Maybe US government should plan that a 13% margin is fair and force Apple to change that instead of 30%? Why not have US government also design the UX for the store or technology for the dev tools? Surely something beneficial for all parties will come from that...
The difference is I can just go to another store with lower margins if I am not happy paying the price or the product manufacturer can offer it directly (Tesla with direct to customer sales instead of middleman dealerships) . I can't do that to get an app on IOS. This is the WHOLE argument. What is to stop Apple from rejecting a subscription based app because it directly competes with their own? (literally what just happened with Microsoft Xcloud) That would pretty much be defined as a Monopoly would it not?