Copilot sometimes reproduces code verbatim. You can't use open source code except under the terms of the license. Authors whose code may be reproduced by Copilot need to grant a license to downstream consumers, and republishers of Copilot-generated code need to adhere to the terms of that license.
Copilot is inserting ticking time-bombs into its users' codebases.
I can't see any case where originality of the snippet presented by Copilit matters (if Copilot were a person, it would matter to determining if the snippet on its own was copyrightable by Copilot, but still wouldn't be relevant to whether to original copyright was violated.)