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The Internet Archive just lost its appeal over ebook lending
(www.theverge.com)
This is a most excellent place for technology news and articles.
I think that's the difference right there.
One is up for debate, the other one is already heavily regulated currently. Libraries are generally required to have consent if they are making straight copies of copyrighted works. Whether we like it or not.
What AI does is not really a straight up copy, which is why it's fuzzy, and much harder to regulate without stepping in our own toes, specially as tech advances and the difference between a human reading something and a machine doing it becomes harder and harder to detect.