The only thing that I found suspect about Apple's behavior has to do with the push notifications. But even then, it does seems like you can turn them off.

From the Article: "If you subscribe and then cancel, Apple sends invasive push notifications asking you to re-susbscribe. These are on by default without a permission request. This is, of course, against the rules they lay out for other developers."

Apple Rules: Push Notifications must not be required for the app to function, and should not be used for advertising, promotions, or direct marketing purposes or to send sensitive personal or confidential information.