They're setting up matrix servers. Nato uses matrix.
Too bad the UX is dogshit and the end users lose their keys every 90 days. Even though they're explicitly warned, loudly and clearly, to not lose the keys.
Matrix software stack isn't idiot proof; Signal is.
The key is only necessary as a backup these days. You can share the key from one client to another which works well. As long as the user has a laptop and phone it should be ok unless they lose both.
But yeah it would be nice if the key could be escrowed somewhere for big organisations.