And someone accepts it. Even if suggesting derivatives of licensed code is not a license infringement, then Copilot sure is a vector for mass license infringement by the people clicking "Accept suggestion". And those people are unable to know (without doing extensive investigation that completely nullifies the point of the tool) whether that suggestion is potentially a verbatim copy of some existing work in an incompatible license.
If I suggest whole lines of dialogue to you, the screenwriter, did I write those lines or you? If you change names in those lines of dialogue to fit your story, do you now gain credit for writing those lines?
There are situations where the question is are the mishmashes from Copilot 'fair use'.
But the other, more direct question is ... what about the instances where Copilot doesn't come up with a learned mishmash result? What happens when Copilot just gives you a straight up answer from it's learning data, verbatim?
Then you, as a dev, end up with a bunch of code that is effectively copied, via a 'copying tool', which is GPL'd?
It's that specific case that to me sticks out as the 'most concerning part'.
Not sure if you meant to reply to me but I agree with you: you can't compare what Google did to what Copilot does.