The idea that Apple deserves 30% off someone's subscription price is ridiculous. This is obviously different from normal app sales, and app sales don't compete with Apple.
Spotify should not get it hosted for free, they should negotiate a hosting fee on App Store, and not be charged 30% from each subscription.
In fact, a developer should have the option of either taking a 30% cut, or having to pay a hosting fee, and then not get percentage taken off their subscription. There could probably be several levels of the "hosting fee", depending on how many app downloads an app gets, etc.
Thank you - Great post