My bet is that the vast majority of users are like you, so developers who stop distributing on the App Store or distribute on multiple stores will find it doesn’t pay and so the incentive for them will largely remain to distribute on the App Store. Yes there might be niche apps where this doesn’t apply but those are edge cases.

What other store operators should know is that if there’s any compelling feature that sets their store apart, Apple can very rapidly copy it and probable do a better job so there’s really very little incentive to bother creating a store to compete against Apple.

The overwhelming majority of Android users use the Google Play Store.

This is all a colossal waste of time and energy for no practical change.