Owning a lot of Tor exit nodes doesn’t automatically deanonymize users. Exit nodes only see the traffic as it leaves Tor toward the clearnet, not the original sender. To actually identify someone, you’d need to match their traffic entering the network with the traffic exiting - a correlation attack - which requires visibility on both ends. The US doesn’t “own most exits” either; the network is run by many independent operators, and the Tor community actively monitors for malicious relays. Even if a law forced US exit operators to log everything, that alone wouldn’t deanonymize anyone unless combined with large-scale surveillance of entry traffic, which is extremely resource-intensive and not guaranteed to work. In practice, governments can make running exits legally risky, but they can’t just legislate Tor anonymity away.