Bill Goodwin at Computer Weekly talks to Claude Demuth, chairman of LU-CIX, which maintains the Luxchat app.
Luxchat is a The Matrix.org Foundation (npub1m9z…whzq) based sovereign messaging platform for Luxembourg's citizens. It's complemented by Luxchat4Gov, for civil servants, and Luxchat4Pro for businesses.
https://www.computerweekly.com/news/366652431/How-Luxembourg-built-a-secure-sovereign-instant-messaging-service-for-residents