Interesting, so your argument is not about parroting but specifically about the novel code Copilot generates. My sense is that it would be fine for all licenses

Interesting, so your argument is not about parroting but specifically about the novel code Copilot generates. My sense is that it would be fine for all licenses except for AGPL as this is an online service and is not "distributed" per say. That is if you don't buy the argument that machine learning is a transformative work so it doesn't matter what the license is, which is the position of current US caselaw.