Sure, but that's a different end of the issue than I was referring to. I was pointing out that just taking code off of github wouldn't avoid the use case. Any published code from any public source is likely to eventually be used this way by someone.
Yeah, I agree with your point that “if you publish content to the internet, expect it to be used in ways you don’t intend, or even permit.” Just pointing out that a lot of the concerns are not “GitHub is stealing my code for use in Copilot,” but “using GitHub Copilot in my proprietary software is a massive risk/liability.”