> If it is all those three via TOR's utility I'd love it, but I'm guessing it is neither or just one. It is all three, but it's not technical NAT hole punching

> If it is all those three via TOR's utility I'd love it, but I'm guessing it is neither or just one. It is all three, but it's not technical NAT hole punching as much as just connecting to relays. So any device that can call out to the internet can setup a local onion service, similar to how those localhost-to-public-address dev tunnels work.