At some point iOS feels like a third class platform, because I can't directly buy subscriptions or download my (already paid for externally!) Audible audio books. I think Apple is too arrogant to change this on their own so my only hope is the EU will regulate quasi-monopolies like the app store at some point. At the moment Apple users would benefit from a lot of regulations ranging from freedom of choice in the App Store to right to repair. That's not a good spot to be put in as a customer.
This is about books sold from iTunes. I'm talking about buying books from your Audible credits in the Audible app. But given this info, the most charitable interpretation would be that Audible stopped selling via Apple all together. A less charitable interpretation would be that Apples guidelines forbid Audible to sell content without Apple getting their cut.
