Earlier quoted context omitted.
What does it matter if someone can claim your commits? Doesn't seem important imo.
Since [by default] you own the IP for code you commit, this is effectively claiming to steal intellectual property. Also professional credit and fame, which can directly relate to employment opportunities.
>which can directly relate to employment opportunities.
doesn't seem right.
Agreed on the copyright part of the equation, but I don't think many people take the commit author on GitHub as the copyright owner.