I don’t have much context, but I’ve never seen Amazon as a technical leader in the industry. They’re absolutely a business leader, and the services they provide can be good, but at a code level I’ve always thought of them as very MVP, if it works it’s good enough.

For code review services I’d expect a level far above this. Maybe they are able to do that, but I don’t have any existing positive bias towards this, and a few things against it.