> Each "app store" would have it's own ability to set those policies for apps it carries - but (crucially) users would have the OPTION.
> For users that don't care - stick with Apple.
As an Apple user, to me this is the opposite of having "options".
As an individual, I cannot fight any remotely large company let alone FB or Google. If they hold my messaging or email hostage, I would be forced to use their secondary iOS app stores with their custom rules, etc.
As a group, all Apple users, we have a unified choice. It puts the power dynamic back into users hands. Users that don't like the choices of Apple should buy other phones, and if enough people buy other phones the Apple ecosystem will change with the market.
Users that do want to be part of the collective bargaining power of the Apple ecosystem, like me, should have that choice!
One very important question to ask is, why do users spend more money on iOS apps than on Android apps[1]? For 6 years, while I owned an Android I never made a single purchase. My last 4 years on iOS, I buy apps, I start subscriptions, I use Apple Pay, etc. I can tell you it is entirely because of my trust in Apple as a company. A large part of that trust is earned through the regulations they put on developers and their emphasis on my privacy.
I can guarantee you, as soon as Apple is no longer able to earn that trust, the entire ecosystem will be significantly less lucrative for developers and this whole exercise will have been in vain, hurting everyone (users and developers).
[1] https://www.techaheadcorp.com/blog/android-vs-ios/