

Maybe not a service in the typical sense, but setting up your router+server to route your home network traffic through a VPN is a fun project.
My router (MikroTik) supports WireGuard, so I can use it with Mullvad for the whole house—but wg is demanding and it’s a slow router, so while it can NAT at ~1Gbps, it can’t do WireGuard at more than ~90Mbps. So, I set up WireGuard/Mullvad on a little SBC with a fast processor, and have my router use that instead. Using policy based routing and/or mangling, I can have different VLANs/subnets/individual hosts selectively routed through the VPN.
It’s a fun exercise, not sure I implemented it in a smart way, but it works :)


Chuck Yeager’s Air Combat would ask for various airplane specs (“what is the service ceiling of an F-4E?,” “what is the ferry range of a MiG-15?”), and you had to flip through a booklet to find the answer.
You could copy the book, but it was fairly long so I guess the friction kept you in check.