Who runs it
Amazon. It names itself with the token Amazonbot. Amazon runs two siblings with their own tokens, Amzn-SearchBot and Amzn-User.
What it does
Amazon says Amazonbot is used to improve its products and services. It honors nofollow links and the noarchive, noindex and none meta tags.
Renders JavaScript
Not yet observed. Amazon doesn't say whether Amazonbot runs scripts, and this site hasn't recorded a verified visit yet.
How to verify it
Match the visiting address against Amazon's published list. Amazon documents no reverse DNS check for it.
robots.txt
Amazon says automated crawling from its listed user agents respects the Robots Exclusion Protocol, reads the file at the host level and caches it for up to 30 days. It does not support Crawl-delay. Amazon says Amzn-User may not follow all directives, because a user can initiate its actions.
Questions
Does Amazonbot support Crawl-delay?
No. Amazon says its crawlers do not support the crawl-delay directive.