As another commenter says, this is about IP, but even positing that copyright is somehow invalid because it’s new is incredibly obtuse. You know what other law is relatively new? Women’s suffrage.
I’m annoyed by arguments like the above because they’re clearly derived from working backwards from a desired conclusion; in this case, that someone’s original work can be consumed and repurposed to create profit by someone else. Our laws and society have determined this to be illegal; the fact that it would be con isn’t for OpenAI if it weren’t has no bearing.