https://www.quora.com/How-much-do-game-companies-make-from-e...
A more telling comparison would be a download-only game that was self-published by the developer since app store apps don't usually have separate publishers, physical distribution or retailers.
Although I agree that the lack of open alternatives for app distribution in the game console world is pretty similar.
For many small/medium businesses, the Apple/Google tax is often much higher than the founders salaries.
About the value apple provide, try to create your own software distribution channel, and check how much is it costs.
Yet Apple don't charge a distribution channel cost if your app is free-at-download. How does that make sense? The backend costs to them are the same. In fact they're likely to be higher for free apps due to the many magnitudes more downloads versus subscription apps.
Apple want to have it both ways: the thriving ecosystem of free apps that promotes the platform AND their cut of subscription apps. Legislation that said that all app publishers should pay a flat fee per download would seem the fairest way forward.
They don't need any of that for free things.