I think there's more nuance here - I have several domains (name related) that point to my router and serve solely private services, often on non-standard ports.

I think there's more nuance here - I have several domains (name related) that point to my router and serve solely private services, often on non-standard ports. They'll appear empty unless you happen to be scanning high-number random ports, but I'm using them and they're providing value to me.