[wkat4242]

But maritime and air traffic is not personal, it's factual professional traffic. You're invading no one's privacy by listening to it, and if you're allowed to monitor ADS-B and AIS why not the voice version which conveys similar information?

And even messages to other traffic isn't officially allowed? That doesn't make sense. In fact pilots are always encouraged to monitor all radio traffic even the messages not meant for them as it builds a valuable picture of the traffic around them and its intentions. This saves lives on a regular basis.

Besides it being unenforceable it also would seem a bad idea to discourage it.