It's not just Mturks.
From the horse's mouth "For fun, we'll also use a community of real people to find product matches on Amazon.com." @ http://www.amazon.com/gp/help/customer/display.html?ie=UTF8&...
"After you send us a photo, we'll store it on your Amazon Remembers list (similar to your Wish List) in the app and in your Lists at Amazon.com. For fun, we'll also use a community of real people to find product matches on Amazon.com."