>But that is neither the intended use of the product nor the actual way that a single person using the product really employs it, and that really, really matters

And yet, someone has done so, and found that to be the case. Therefore, it falls under "normal use".

So make up your mind. Is software engineering only about assembling working programs, or assembling working programs + navigating license minutiae?

One of these, Copilot has a place in. The other it does not.