I would also note that being able to painlessly cancel a subscription at any time is a big incentive for users to buy subscriptions through the iOS App Store.

I would also note that being able to painlessly cancel a subscription at any time is a big incentive for users to buy subscriptions through the iOS App Store. Having recently jumped through the series of hoops necessary to cancel an NYTimes subscription, I am strongly biased towards App Store and Amazon-Prime-based subscriptions, even though they are arguably unfair to the providers.