Earlier quoted context omitted.
Yeah, this is what makes me feel this is more an AWS thing
The m.media-amazon.com domain (and a few other CDN'd domains that they use) are running through Fastly: nslookup m.media-amazon.com Name: media.amazon.map.fastly.net It is very interesting that they are not using CloudFront!
Amazon is also known to use Akamai. Sure, Amazon relies heavily on AWS, but why should it surprise anyone that a retail website obsessed with instant loading of pages decides to use non-AWS CDNs if the performance is better.
Even if CloudFront became the default, I'm certain amazon.com would keep contracts with fastly and akamai just so they can weight traffic away from CloudFront in an outage.