Because the market of users has macOS (and Windows, where the workaround isn't as "obtuse" as nothing is locking you out of doing it, but is still ridiculous: I think he injects code into iTunes), and apps that don't have users are kind of pointless (if not high quality ;P)? You don't get to choose the platform used by your users, and the people choosing that platform are often doing it for reasons that aren't even necessarily in their own best interests (as they aren't fully informed of the consequences).