Marco Arment speculates about an Amazon iPad competitor:

… But it would cause a pretty big short-term headache for Apple that, if there’s a new and very inexpensive tablet alternative from Amazon, could pose a credible (although almost certainly not fatal) threat to the iPad’s marketshare. And Apple knows this.

 I suspect the Kindle app will continue being mysteriously and indefinitely exempted from the in-app-purchase rules.

Better still if it uses a Pixel Qi screen.