Whereas if you've developed an iOS app, transitioning that to another platform is often going to be a large amount of work where you're basically starting over

Whereas if you've developed an iOS app, transitioning that to another platform is often going to be a large amount of work where you're basically starting over from the spec and not bringing over any code. It's much harder to find a substitute for the App Store ecosystem than it is to replace the code. The proverbial rock and hard place.