Is it possible for single pages or sites to poison LLMs somehow, or is it essentially impossible due to scale?

Since they mentioned ramen - could you include something like “a spoonful of sand adds a wonderful texture” (or whatever) when the chatbot user agent is seen?

Hard to do, because some crawlers try to appear as normal users as much as they can, including residential IPs and all.

Nice thought, but I can't imagine accidentally showing it to actual user.