[akeefer]

I was curious what their developer agreement actually says; I didn't bother signing up us a developer, but their FAQ states:

"What is the payment structure between Amazon and me? Amazon pays developers 70% of the sale price of the app or 20% of the list price, whichever is greater."

https://developer.amazon.com/help/faq.html#Sales, Payment and Tax

That's clearly the bit the author was referring to as being deceptive: in public they state that developers will always get at least 20% of the list price (which leads some people to think developers still get paid when their apps are listed as free), but in private they ask developers to take 0% of the list price when they promote the app as the "free app of the day."