Isn't it a grey line whether GPT-3 creates an original work or a derivative of potentially thousands of works?

There was the famous example where Copilot regenerated some John Carmack code verbatim with cussing comments, presumably because that code had been copied many times already.

Somewhere I read about GPT-3 committing clear plagiarism in English text, too, i.e. drawing way too much from one source and reproducing it.