Discover Card, which spends ~$15M/yr advertising with Amazon, wanted to give a $10 gift card to Kindle users that changed their default Amazon 1-Click purchase settings to use a Discover card. Instead, Amazon gave the gift cards to everyone that used Discover for a 1-click digital purchase, the vast majority of whom already had Discover as their default 1-Click purchase card. Discover's $500K budget was predictably drained in rapid fashion, and they barely got any of the actions they had agreed to pay for. The author of this letter was encouraged to hide this fact, pitch it as an overwhelming success of the campaign, and to ask Discover to expand the budget. He was fired after complaining about being uncomfortable with participating in obvious fraud against their 2nd largest advertiser, and is now suing Amazon.
The failures here occurred in every department. First, at a fundamental technical level, I don't understand how this could happen in the first place if it wasn't intentional. This was a simple CPA campaign. When someone changed their default card to Discover, they got a gift card. So it begins with their "ad execution team". Second, the moment the problem was discovered, they should have simply credited the campaign such that they were only charged for the actions they agreed and intended to pay for. Third, any employee actively involved in encouraging fraud, let alone fraud against their 2nd largest advertiser, should be fired. Their engineering, marketing, legal, and HR teams all failed miserably on this one.
I don't envision myself ever having a need to run a CPA campaign through Amazon, but based on this I would stay away from them as much as possible. They had to have multiple internal discussions about whether or not they should commit a crime against a multi-million dollar advertiser. That's certainly enough to scare me away.