I assume it’s percentage-based to allow for free apps (which are an important part of the overall ecosystem). How do you allow free apps but still collect mone

I assume it’s percentage-based to allow for free apps (which are an important part of the overall ecosystem). How do you allow free apps but still collect money? Maybe you could make a distinction between free and paid apps, and charge a flat fee to the paid apps, but then people would just make their apps free and process their payments separately anyway; essentially the same problem you hit with the 30% fee.