FWIW this in consequence means you can't legally use Copilot without becoming liable to copyright violations because it's essentially a black box and you have no insight into where the code it generates originated and even if it isn't a 1-to-1 copy it might be a "derivative work".

This is why I'm gnashing my teeth whenever I hear companies being fine with their employees using Copilot for public-facing code. In terms of liability, this is like going back from package managers to copying code snippets of blogs and forum posts.