They aren't taking a 30% cut to "promote" you. They are taking the cut and providing billing services like credit card processing. They also provide access to y

They aren't taking a 30% cut to "promote" you. They are taking the cut and providing billing services like credit card processing. They also provide access to your app and apis for you to connect and use phone features. They also host your app binary and provide update services. But the main reason they charge 30% is because they can. If they offered no value for that 30%, then no one would pay for it. I agree it's too much. But they do offer something for that 30%.