Alt227 has a point but the Tor network is centered around a handful countries where traffic is cheap and there aren't that many huge IXs and Tier 1 ISPs where much of the traffic flows through.
I'm not saying that this is done but it's IMHO more likely than state actors running thousands of relays.
“a state actor has the physical capabilities/resources to perform an attack that determines Alice was speaking to Bob.”
I totally agree. Im just pointing out that we still have layer 5 encryption to protect the contents of our messages. Also at that point, if you’re so important they would just grab a warrant and raid your home.