Publisher and printer, in some countries, can be sued for plagiarism or libel. The LLM system combines content scraped from the internet from many sources, so is technically all plagiarism (though from combined sources) and could easily have libel.
The makers of these systems can't afford to human curate the input so that it's all PD and the users invoking the output are not usually qualified to spot plagiarism or libel.
So it's not just about reading it to spot if it's junk. The better it is and less like junk, the more likely it's going to infringe rights of existing people, or have real named people and apply plausible "junk" (i.e. lies) about them.
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