There is a lot I hate about building apps and releasing them on the App Store, and I'd be happy for there to be alternatives. But that said, I don't understand how its a monopoly. There is no requirement to build an app for iOS devices. There are other devices and means for software delivery out there. What makes their control of their own ecosystem monopolistic? As someone who has paid the apple tax for digital sale…
By this logic, there is also no requirement for one to eat and breathe, anyone can simply stop. The problem is the consequences.
Building an iOS app is requirement if you want to provide lots of services and compete on lots of market. The mobile phone OS landscape has become a duopoly, and society is free to impose certain obligations on those companies.