Being in the AppStore gives you access to a lot of people. I don’t feel it’s at all relevant whether you happen to also have other exposure elsewhere. Apple charges you for the exposure you get from them, period. If you don’t want to pay for it, because you’re so successful on other channels, just don’t. Don’t have an iOS app. But for years we’ve had people who want an iOS app but also want to complain about sharing what they make from it. They still make too much to be willing to pull their app, but they complain anyway: because who doesn’t want higher margins.