I mean I'm not an expert but it's a valid point as people share code under a given license, and as far as I'm aware Copilot does not make this knowledge available. Nothing to do with the fact that Copilot is an amazing technological achievement.
If I, as a human, go to a public repository on Github and copy/paste a non-trivial 200 line code snippet into my proprietary code base I have to abide by the license of that original code, even if I slightly modify it. I don't see how this cannot be true for Copilot. I'm sure the legal folks at Github have thought of a response though, you could e.g. argue that the snippets produced by Copilot are not affected by the copyright of the original author as they do not reach the required treshold of originality. Seems rather shaky for me though.
If I, as a human, go to a public repository on Github and copy/paste a non-trivial 200 line code snippet into my proprietary code base I have to abide by the license of that original code, even if I slightly modify it. I don't see how this cannot be true for Copilot. I'm sure the legal folks at Github have thought of a response though, you could e.g. argue that the snippets produced by Copilot are not affected by the copyright of the original author as they do not reach the required treshold of originality. Seems rather shaky for me though.