What would be fair is for people to be able to install apps from alternative app stores, and to drive that percentage down via competition. Some competitor app

What would be fair is for people to be able to install apps from alternative app stores, and to drive that percentage down via competition. Some competitor app stores may charge as low as 5%, to pay for processing fees. And others will charge different fees. And the app store that is the most competitive will get most of the business.