All SO questions, answers and comments are CC BY-SA. The terms of the site say that anyone submitting this content agrees that it's licensed that way, and when you visit the site you agree that you are provided with the content under that license. It's not necessary for you to check whether the submitter had the right to offer it under that license; that's their problem. The same goes for any content offered to you under a given license on any platform. I don't understand what your question has to do with the conversation.
The problem with Copilot, and I really can't believe this has to be restated over and over again, is that it takes code from projects with various licenses, and outputs it in your editor in various transformed-or-not-transformed ways (the fact that the transformation is extremely complex doesn't change anything), and gives you no way to know where the code came from, how it was licensed or how it has been transformed. So, despite the fact that if you use it enough you are virtually guaranteed to use code in contravention of its license, you cannot even know which projects you have stolen code from or which licenses' terms you are breaking.
> Also, please consider that there is a toggle that allows you to block Copilot from using public code.
Great. I'm sure its utility doesn't go down at all if you turn that toggle off...