The reason you can't buy books in the Kindle app probably has more to do with the fact that Apple requires payments for all digital goods to go through it's ser

The reason you can't buy books in the Kindle app probably has more to do with the fact that Apple requires payments for all digital goods to go through it's service and collect 30% of the revenue (15% if its a subscription after the first 12 months). It does not make the same requirement for physical goods. I continue to be divided about this, the point of view is understandable, as it would threaten app store revenue (every app would just switch to a digital subscription outside of apple and never charge for the apps) however there's also a clear line of digital goods that are more physical like in nature (rather than just the software) such as eBooks etc and the 30% margin is high enough to ruin most business plans. This particular rejection is somewhat irritating though.