My matrix server is nearing 5 years old. I have federation disabled, because I don't need that - we are using it as a family chat. sqlite database I'm using is now 2GB, but other than that it is working great.
I do acknowledge that I'm not leveraging the things matrix is designed for (federation, e2e encryption), but to be honest, it's not really good at that.
The revolutionary thing about sandstorm is not all that much about administering hosting as it is about integrating deeply with applications.