“Co-authored by Copilot” gives a multi billion dollar corp free advertising. I don’t care about them. I do care about Joe though.
Case in point, I have no way to know if dylan604 is even a real human at this point.
How could it possibly be product placement? It's got electrolytes!
There's also the named authors not taking credit for something they didn't fully do, regardless of whether the credit goes to someone else.
There's also traceability, if the authors/provenance needs to be considered because of some kind of problem or potential problem -- technical, legal, security, or otherwise.
Advertising in git commits is not ever going to substantially discredit these people or hold them accountable.
The fact that it's just a tool is irrelevant. You don't need to mention search and replace because everyone already knows that exists... mind you I have had commit messages which included sed commandlines, for ease of future reuse.
(The first sentence isn't a joke.)
What's the problem with the approach?