A. There are more than two stores on mobile. Android does have more than the Play store...it's just that Google has put up more and more barriers for those alternate stores in the system that they call "open". Regardless, prices for apps on desktop/laptop have always been significantly more expensive than on mobile despite the larger number of 3rd party stores. One of the hallmarks of the mobile era was how incredibly cheap the apps were versus what people were accustomed to on non-mobile operating systems....but there's more than two digital applications download stores in the desktop market.
And neither Microsoft nor Apple are mandating that every piece of software be approved by them nor do they enforce commissions by mandating all software sales going through their own store.
Neither do they restrict cloud gaming apps and content - nor do their prohibit development, distribution and usage of alternative web browser engines in the desktop/laptop market.
B. Google/Apple don't really mandate that all software sales go through them. Large general consumer oriented apps like Netflix, Spotify, and Amazon Kindle moved all of their sales to the internet. And games like Fortnite did, in fact, sell virtual currency online that could be used in their iOS games and that VC was also sold in the form of gift cards in standard retail stores.
C. Both Android/iOS devices give users access to the internet. Neither Google or Apple attempt to control or prohibit anything on the internet. iOS users have access to multiple cloud gaming services via the internet...Gamepass, GEForce Now, Luna etc. As for browsers, I've asked people making the same browser engine point as you to explain the benefit of using an alternate engine versus Webkit and there isn't much response.
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