Think textbooks. Laws. Medicine.
What's the difference? The size of quotation? The exact wording? Surely re-publishing an entire book word for word is piracy. What if I rewrite the whole book slightly? What if I publish just a part? A rewritten part?
Where do we draw the line with humans and why should the line be different with LLMs?
(I don't have answers to those questions)
In particular, you are a legal person who can be sued in civil court if you infringe on copyright. If I ask you "can you help me write a blog about Manhattan?" and you plagiarize the New York Times, then the NYT sues me for copyright infringement, then I would correctly assume you conned me, and you are responsible for the infringement, and I would vindictively drag you into the lawsuit with me. With LLMs it involves dragging in a corporation, much much uglier. Claude is not actually a person and cannot testify in any legally legitimate trial. (I am sure it will happen soon in some kangaroo court.)
See, the line is blurry.
Based on this comment: https://news.ycombinator.com/item?id=47960014 it seems like you are just ignorant about the basics of copyright law, and pretending this ignorance is some sort of flaw in the idea of copyright itself.