The four pronged test in US case law:
- the purpose and character of use (is a machine doing this different in purpose and character? many would say yes. is "ripping-off-this-artist-as-a-service" different than an isolated work that builds upon another artist's art?)
- the nature of the copyrighted work
- the amount and substantiality of the portion taken (can this be substantially different with AI?)
- the effect of the use upon the potential market for the original work (might mechanization of reproducing a given style have a larger impact than an individual artist inspired by it?)
These are well balanced tests, allowing me as a classroom teacher to duplicate articles nearly freely but preventing me from duplicating books en masse for profit (different purpose; different portion taken; different impact on market).
And just to be clear, this post does not constitute legal advice.
I hate the desire to meta-comment about the site rather than argue on the merits.
We obviously don't know so much about how courts will interpret copyright with LLMs. There's a lot of arguments on all sides, and we're only going to know in several years after a whole lot of case law solidifies. There are so many questions, (fair use, originality, can weights be copyrighted? when can model output be copyrighted? etc etc etc). Not to mention that the legislative branch may weigh in.
This discourse by citizens who are informed about technology is essential for technology to be regulated well, even if not all participants in the conversation are as legally informed as you'd wish. Today's well-meaning intuition about what deserves copyright and why inform tomorrow's case law and legislation.