No, I'm going to let 'jchw do it for me, because they are more patient than I would have been and make me thankful I didn't go down that route. I don't really want to engage with someone whose argument is "there's no harm because the harm is plagiarism and according to OpenAI plagiarism is OK".
How is plagiarism harmful outside of an academic setting? Is it illegal? Who is hurt by it? In what way? Does this supposed harm outweigh the benefit it brings to the rest of society? And, mostly unrelated, why are you okay with bigtech doing it, but not a mere human?
Just admit you realized that you don't actually have an argument. It's a simple question, and you're not able to answer it.
It's okay to admit you were wrong. It shows growth.