If that's the case, then there will not be any users of Copilot except those that unknowingly open themselves to liability. I suspect there will be few.
I would be okay with that situation. But I'm not okay with the situation as it currently stands.
Where it stands: We have a new technology. We don't really understand it. There aren't well-defined ethical or legal bounds. We're figuring them out, blumbering along as we go. People are trying things, and are making all sorts of arguments, some of which will stand the test of time, and some of which won't.
I'm more concerned when we do this with weapons, medicine, or social science, but an autocomplete tool seems like a relatively benign place to start figuring this out.
But let's fix this before it goes further, especially since mindlessly copying output from a machine will probably result in more bugs.