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There is a whole genre of copyright infringement where someone will scrape a website and create a per-pixel copy of it but loaded up with ads, and blackhat SEOed to show up above the original website on searches. That's bad, and to the extent that LLMs are doing similar things, they are bad too.
Imagine I scrape your elaborate GameFAQs walkthrough of A Link to the Past. I could 1) use what I learn to direct curious people to its URL, or 2) remove your name from it, cut it into pieces, and rehost the content on my own page, mashed up with other walkthroughs of the same game. Then I sell this service as a revolutionary breakthrough that will free people from relying on carefully poring through GameFAQs walkthroughs ever again.
People will get mad about the second one, and to the extent what LLMs do is like that, will get mad at LLMs.