It's not about Copilot, per se -- but it's clear that most users probably didn't understand when then signed up that they're giving Github (now Microsoft, let's not forget) the right to use their code, at all.

I've never been comfortable with the idea of trusting IP in places like Github, Google, etc. Although I find Copilot amazing, I find the use of user's code as distasteful as I do understandable.