That makes no sense to me. Licensing copyrighted work is pretty standard, and it must be in France too? The GPL is a license, which is indeed a contract. But surely people license (enter into a contract between copyright holder and user which grants certain allowed uses) copyrighted work in France routinely?
But if there is a contract in place, then copyright law no longer applies, and you instead have to resolve any disputes as if they were violations of a contract.
The difficulty being that the GPL allows anyone to enter into a contract without even consent of the other party, and the contract law courts may not see that as a valid contract.
No, it doesn't. Voluntarily, publicly offering the GPL as license terms is consenting to others accepting that offer.
https://thehftguy.com/2020/09/15/french-judge-rules-gpl-lice...
The article is quite light on details, I wonder on what exact grounds they filed their claim.