Generally, a copilot is someone you can trust. The whole point of having a copilot is to reduce my cognitive load. If I am a pilot and have my copilot fly the plane while I do something else, I may be in charge, but I trust him to fly safely and alert me if things go wrong. A copilot is also a licensed pilot, able to do almost everything the pilot does, he is just not in charge.

The article shows that I can't trust GitHub copilot. So I don't think it is a representative name. Here, it would be more like a servant.