There isn't going to be any reaction because they can't crank it up to 50 or 70 percent because developers would leave. Which means it's not a monopoly.
Developers wouldn't leave, the apple app store generates so much revenue that it would be much more profitable than android even if they lost half of it. What would happen is that governments all over the world would quickly rush to regulate Apples power away, that is what Apple is worried about and why they lowered it for small developers to 15% already, they aren't worried about competition here.
> Developers wouldn't leave, the apple app store generates so much revenue that it would be much more profitable than android even if they lost half of it.
You're countering your own point. The fact that there is so much money to be made on the app store, is why they have a right to charge 30%. They created the platform, and made it a great place to buy apps for users, and a lucrative place to sell apps for developers.
iPhone users are wealthier than Android users, that is the main reason the platform is more lucrative. Apple did a great job creating phones that users wants and charges a premium for them, which is great. What is not so great is that Apple then uses their dominance in the premium phone market to become the gatekeeper of a majority of phone app revenue, resulting in Apple taking a 30% cut of most app sales in the world. They don't have the most phones, no, but they have most of the phone app market.
And as phones are taking over phone apps are becoming an ever more important part of our lives. Apple can't just sit there and charge 30% of phone apps forever, that starves an upcoming market and holds back progress.