Oh, wow! The German IT Planning Council decided yesterday to consolidate a bunch of disparate communication tools into a unified system based on Matrix and MLS.
Here's the record of their decision and the other options they considered: https://gitlab.opencode.de/it-planungsrat/fit-ab/zapuk/-/blob/main/Zielarchitektur/Architekturentscheidungen/ADR-0011-Kommunikationsschicht.md