I don't have any proof but I'm certain Germany must have made some sort of funding for matrix
https://matrix.org/blog/2021/07/21/germanys-national-healthc...
https://matrix.org/blog/2021/07/21/germanys-national-healthc...
https://www.heise.de/newsticker/meldung/Bundeswehr-setzt-kue...
The ones getting most of the money will probably be third-party developers integrating Matrix into their gematik-certified healthcare products.