Matrix is in an interesting position right now because it's honestly not great, but it does exist.

And having control over something that is not great sounds a lot better than having no control at all (in this case over something else that is not great either, i.e. Teams).

Governments don't change easily. It took a threat of military invasion for some of them to start considering moving away from Teams. Whoever gets to replace Teams will probably stay for a while even if it is frustrating (again, just like Teams is).