What if it was just a single person? I take it you didn't read any of the code in the ocaml vibe pr that was posted a bit ago? The one where Claude copied non just implementation specifics, but even the copyright headers from a named, specific person.
It's clear that you can have no idea if the magic black box is copying from a single source, or from many.
So your comment boils down to; plagiarism is fine as long as I don't have to think about it. Are you really arguing that's ok?