Soon we'll have the Verizon Appstore and the Spotify Appstore and the Zoom Appstore, the exclusive home for each app and their partners, each with it's own overlapping user tracking libraries and insecure payment methods, and no one can even tell them to do otherwise. Coming soon to iOS, too!
Realistically, this never happens. making a platform isn't some cheap endeavor like a landing page for a website. Most people will stay on the play store and use play services. Those with more skin will consider alternative stores, and then lastly some will make their own platforms.