Doesn't Valve take 30% from games on Steam? But they're complaining Apple taking 30% is too much? I also don't really think the Apple/Google fee is that unreasonable. Considering the resources, tools, marketplaces, tutorials, payment processing, all the other All dev stuff they provide in general. Yes if your app goes big, they make a lot of money. But for every big app there's something like 9 that fail completely (…
I mean it would be like Amazon paying Apple a cut, if I buy a TV from amazon. AFAIK, it is only for digital goods that Apple charges, but I am not sure how the demarcation works.
On the flip side, if Apple/Google allow any app to use in-app purchases without a commission, then all apps will use in-app purchases for everything.