Except it's not. People don't download Uber or Netflix because of the app stores. Epic demonstrated unequivocally they could get installs without Google involved as an intermediary. The app store value at this point is singularly it their platform-specific monopolies, and the fact that you have no choice but to play ball to do business on mobile.
> The real world equivalent is supermarkets
It's nothing like that. I have multiple supermarket chains I can go to - I have only Apple and Google when dealing with mobile. Customers can choose either Apple or Google, but most businesses are stuck doing business with both. Not even Microsoft screwed over both sides like this.
At this point, Google and Apple have done far more harm to both customers and businesses than Microsoft ever had. It's beyond frustrating.