“Co-authored by Copilot” gives a multi billion dollar corp free advertising. I don’t care about them. I do care about Joe though.
How could it possibly be product placement? It's got electrolytes!
Case in point, I have no way to know if dylan604 is even a real human at this point.
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.