[schwartzworld]

Even if it's not copying word for word, if it's not citing its data, it's still plagiarism. Plagiarism includes copying ideas without crediting their source.

[grayhatter]

so no way to prove this claim isn't something someone made up one day?

[schwartzworld]

Here's a counter question:

Have you ever seen chatgpt cite or credit it's sources?

[grayhatter]

I don't (yet) believe that what chatgpt does requires citation to be ethical/honest.

[schwartzworld]

It may depending on the source material it uses. Especially if you're publishing that material.