That's not what's happening here. Copyright work remains copyrighted regardless of how you produced it. If you lived in a secluded cave and completely independently wrote Harry Potter and the Sorcerer's Stone (unlikely, I know, but it's hypothetical), you'd be violating J.K. Rowling's copyright by selling it.

Copilot doesn't help people intentionally launder copyrighted code. It may cause people to accidentally use copyrighted code without realizing it. They're still liable.