But this is only for snippets right? Which I think is the issue: it has never been tested in court. Basically if you put:

     /* web user management */

And copilot comes up with complete user management lifted out of another repo with all pages, db structures and logic but the copyrights stripped then yes. But, as I understand it, that is not what it does. You will need to slowly tell it every tiny part of how user mamagement is to be implemented and for those snippets it copies code. But when you are done, there might be snippets from 100s of different repositories potentially. I think it is hard to show that breaks copyright as many people already come up with roughly the same stuff 1000s times/day all over the world.