It occurs to me that an individual could build something like a "personal ngrok" on top of holesail, right?

Like if I had a cloud VPS as one of my holesail peers, and that VPS has a small service running that notices when new tunnels are opened and exposes them publicly at a subdomain scheme.

So I could either share services p2p, or if I wanted to make a service "public" I choose to share it with my ngrok-like server and it would automatically get exposed.