France’s government is building its own encrypted messenger service
This isn’t a case of NIH; France has adopted Matrix for the project, which is a lightweight fork of Riot.im combined with a large private federation of Matrix servers. The whole thing is open source (although not public yet, as it is very early days) and open standards based. At Matrix.org we’ve been providing some support to them :) It’s very exciting to see open government projects which actually grok open source and open standards.