> Second, make your App Store a non-profit that charges enough for ongoing store development and distribution. This gets devs on board

You're hilariously underestimating the difficulty of getting the dev/user flywheel started: developers go where users are, and users won't adopt a platform without the apps they need. Microsoft was literally paying devs for submitting apps, and they mostly got variants of Flashlight apps, and none of the apps that matter. Look at the top 10 App Store/Play Store apps and ask yourself if the developers will bother with a hypothetical non-profit, upstart