One Technical Note
Since it wasn't exactly emphasized in this article, I wanted to point out that this is specifically about bridge relays. Hosting normal Tor relays "in the cloud" wouldn't be an especially good plan. Since the systems relies on having relays all over the world to make tracing users harder, hosting a whole bunch with one company would not be too useful.
But bridge relays have a different purpose, they are semi-secret access points to the Tor network for people who are otherwise blocked from accessing it. People in repressive countries for example.