I don't see the issue here. OpenAI trained ChatGPT off my own comments, and your comments, and the comments from the person you replied to.. I didn't authorize it and you probably didn't too.

Meta was caught pirating over 80TB of books to train their AI, and they are claiming not only training AI on other people's stuff is legal, but piracy is also legal (well at least, piracy done by US tech giants is legal)