...in the US. I tried to buy an ebook of the Stormlight Archive from Australia and was sad to discover that DRM-free versions were not available.

I think you missed the joke. Tor is an anonymous relay service, often used for pirating copies.

	▲	freedomben an hour ago \| parent \| next [-]
		I assume GP was referring to Tor Books, (which name confused me immensely at first since I've been using the Tor project for many years) but that would have been an absolutely hilarious joke and I think you interpreting it as a joke is totally reasonable given how prominent the onion router project is.
	▲	wizzwizz4 2 hours ago \| parent \| prev [-]
		Tor Books is a publisher. They run https://www.tor.com/.