Audible iOS App Adds Link To Mobile Store

Audible Enter Mobile Store

According to ZDNet, Audible added a new button in their iOS app that takes the user to their mobile store. This is surprising, considering Apple requires all in-app purchases go through them where they take a 30% cut. Was this an oversight by Appleā€™s App Store auditors, or maybe a precursor to App Store policy changes? Makes me wonder if the next release of Audible will still contain this link.