It's not required that they do so in order to implement a France only block. They just geolocate the requesting IP, and give different answers based on that. Same as Netflix or any other provider geo blocking there content, with the same workarounds.
But also, in answer to your question, sort of, yes. 1.1.1.1 is any cast so that users will be routed to a server geographically near them. So then 1.1.1.1 a user gets in the US is quite literally a different one than a user in France will get.
The venn diagram of people who are technically savvy enough to be able to alter their dns records and people who can and will use a VPN to work around an ip geolocation block is almost a single circle.
