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AI companies are violating a basic social contract of the web and and ignoring robots.txt
(www.theverge.com)
This is a most excellent place for technology news and articles.
For banning: I'm not sure but I don't think so. It seems to me that prefetching behaviour is dictated by a page linking another, to avoid any issue all that the site owner needs to do is to not prefetch links for the honeytrap.
For poisoning: I'm fairly certain that it doesn't. At most you'd prefetch a page full of rubbish.