The Mac App Store gives a hint at what would happen if there was any choice. The amount of software actually available for the Mac is far, far greater than what’s listed in the store. Furthermore, while some quality and notable apps are still in the Mac App Store, many well-known apps are not there. The number of lousy apps is also extremely high every time I go to search or just look at the front page, to the point…
Whether or not Apple permits alternative payment systems for iOS/iPadOS, all the apps will likely remain sandboxed.