Anyone savvy enough to [run a Tor exit node](https://blog.torproject.org/running-exit-node) to obscure his or her network traffic could more easily do so by using [Tor Browser](https://www.torproject.org/projects/torbrowser.html.en).

And this return-address analogy needs to include the fact that a Tor node operator is cryptographically prevented from tracing backward toward the sender.