Matrix, the organisation, takes care of the open source side of things.
BwMessenger is a partnership with "ELEMENT SOFTWARE SARL" (according to https://messenger.bwi.de/datenschutz), the French entity of the commercial side of the people originally behind the open Matrix ecosystem (https://element.io/legal/company-information). I'm not sure why the French entity is doing business with the Germans as Element also has a German entity, but either way the American side is not the one doing the work.
For the American entity, a lot (most?) of the work that's not from unrelated open source contributors seems to be coming in from either EU countries or the UK.
Element is also UK headquartered, albeit with French/German/US subsidiaries when selling to those respective governments. BWI buy via France because when we started working with them we didn’t have a German legal entity yet.
BwMessenger is a partnership with "ELEMENT SOFTWARE SARL" (according to https://messenger.bwi.de/datenschutz), the French entity of the commercial side of the people originally behind the open Matrix ecosystem (https://element.io/legal/company-information). I'm not sure why the French entity is doing business with the Germans as Element also has a German entity, but either way the American side is not the one doing the work.
For the American entity, a lot (most?) of the work that's not from unrelated open source contributors seems to be coming in from either EU countries or the UK.