The “30% cut” only applies to digital goods like apps, software or music. Physical goods like a book ordered from Amazon (or an Uber ride, for example) are exem

The “30% cut” only applies to digital goods like apps, software or music. Physical goods like a book ordered from Amazon (or an Uber ride, for example) are exempt. Amazon-owned properties that sell digital goods are subject to the rule though. That’s for example why you can’t buy Audible audiobooks from within the app.