I have second hand knowledge of lawsuits that have been dropped by the FBI during discovery because it would require them revealing zero days they have on Tor. Recently this has started getting increasing levels of press exposure[1] including in CSAM cases. The FBI has also continued to run CSAM websites after takeover to collect intel, and likely run honeypots for other content. If your adversary is a state actor, p…
According to various sources, such as Snowden's "Permanent Record", the tor network was designed to allow spies in remote locations to communicate securely with a known endpoint (such as CIA headquarters) without anyone being able to easily trace their exact location. The content of the communication itself would not be readable due to strong encryption, but the metadata (source and destination headers) could reveal…
As for Snowden you just described a burner however he would still need to find or know that open WiFi hotspot.