This is what I wrote in my survey for why I'm cancelling my Amazon subscription and switching to other providers for all of my needs (Retail, Media and Devices, Web Services), of which I used all three.

Open Letter screenshot attached.

Text version here: https://docs.google.com/document/d/1NqlccdQeUNqd1xT-aiaLWY1HShAv3w-aJzTheqJ1zUc/edit?usp=drivesdk