[mynameislegion]

Untrue, there are options to set a key so that no-one who doesn't have the key can even contact the onion service.

[viraptor]

If I understand what you mean correctly, you end up with just a private onion network. What's the gain in that case over setting up a dedicated VPN network instead?

[saynsedit]

In theory, the connection between the client and the server would be anonymous.