I can't comment on whether Amazon would access utilize internal information for competitive purposes--I hope they don't--but it's definitely not smart to reveal sensitive product information in discussions. At one point the AWS non-disclosure agreement essentially said that they could use any information they remembered from the conversation to develop products. Unfortunately it came up a couple of companies ago so I don't have the exact text any more. It was surprising to say the least.

I love Amazon's cloud services and use them every day. Even so, you can't lose site of the fact they are a formidable competitor.