Allow or block Amazonbot
User-agent: Amazonbot
Disallow: /Asks Amazonbot not to crawl any page. Well-behaved crawlers stop; it does not stop anyone who ignores robots.txt.
User-agent: Amazonbot
Allow: /Lets Amazonbot crawl everything. You only need this if a broader rule would otherwise block it.
Should you block it?
Blocking Amazonbot asks Amazon not to use new crawls of your pages for training. It doesn't remove you from AI answers, and it doesn't affect Amzn-SearchBot.