Earlier quoted context omitted.
You could also publish on Android or the web and have access to a "the global audience". Comparing the App Store with 20 years old methods is a fallacy. To be realistic you should compare using the Android/Mozilla/Windows/Web distribution methods.
The Android model i.e. the Google model is now the same as Apple's. Only it has the ability to sideload applications which let's be honest as primarily been used for installing pirated applications.
[1] Ironically, I think the pervasive sideloading third-party app stores on Android require is a bug, not a feature. I'd much rather see an official way to add "known sources" so that, after the initial install, you didn't need to leave sideloading enabled in order to use them.