I was worried they'd picked some proprietary option, but no, it looks like the French government is investing in an open source videoconferencing solution to replace their usage of Zoom.
Repo: https://github.com/suitenumerique/meet
(EDIT:) Sadly, the open stack they rely on still heavily ties into VC-funded US tech that's used, among other things, for border surveillance:
https://blog.livekit.io/livekit-series-c/
https://www.politico.eu/article/france-ban-officials-us-video-tools-zoom-teams-visio/