It first showed up on amazon.com for me yesterday. I found an article that mentioned it popping up on there from like a month ago, so they might be doing a slow roll-out or something.
It's basically just an AI chat window that pops up on all of the product pages. I thought it was pretty obnoxious.
Aha, maybe you can block it with ublock origin or something. I don't look at amazon pages much, but occasionally do, and haven't noticed the bot so far. It may already be in the ublock origin block list.