Have you tried publishing apps for the App/Play Store? Last time I made a game with Unity then I had to export it to different platforms and for some of them, such as iOS, then I had to make additional code modifications with xcode to get e.g. ads to work properly. I’d easily end up spending a day on making sure each store listing looked good (required files in different formats, and tons of settings to setup).

I also struggle to think of a scenario in which you wouldn’t want your app published on all app stores (unless you for moral reasons wouldn’t want your app on Chinese-owned stores or something like that).

Yes, I do have applications on Android, iOS, macOS.

I want more competition in app stores, I want places where adult applications can be distributed which is completely impossible at the moment. I want app stores that offer different models than what Apple and google do. I want Apple to have to improve their developer experience because of competition (the google play store is way simpler to deal with in my experience). Etc.

And you’re right, it’s a pain to deal with them.