From what I can tell, there is no option - any type of outside subscription or content that can be accessed through an iOS app must also be offered as an app st

From what I can tell, there is no option - any type of outside subscription or content that can be accessed through an iOS app must also be offered as an app store subscription or in-app purchase (with the 30% cut). This means that books on the Kindle app, subscriptions through Rdio or Rhapsody, and many other low-margin products and services will be subjected to Apple's ridiculous 30% take.