Sideloading is not accessible to everyone, even though it's fairly easy to achieve. Most users, even technical, would not want to rely on such methods for installing a development environment (or customising their devices for example); Any tentative for monetising an application that depends on sideloading would be bound to fail at scale.

Is the context I described responsible for the lack of market? It may be.

I still think that iOS is the best mobile experience out there, but it's