But GPL requires the resulting derivative code to be open-sourced under GPL, not just attributed. So if you did that then copilot could only emit code under a G

But GPL requires the resulting derivative code to be open-sourced under GPL, not just attributed. So if you did that then copilot could only emit code under a GPL license. Maybe that is okay, but it is not what copilot is trying to do at the moment. (And not everyone wants to open-source all their code under GPL.)