Because it's public information that's literally broadcast to anyone listening by every aircraft above a certain size/speed. This isn't information that is considered secret or even that one needs to dig to expose, the aircraft is actively transmitting regular messages containing its location, heading, and speed to anyone within radio range which can be tens or hundreds of miles depending on altitude.
Because airports have a giant security ring around airplanes, so you can’t physically get close to him with this information. And it’s transient, so you can’t lurk and wait to strike.
It’s like a comedian doing a planned show.
Plus, the tracking is on Elon's jet, not Elon as a person. So nothing is preventing Elon from sending his jet to NY, while flying, charter or first class, to Miami.
this is not tracking Elon Musk personal movements, this is tracking 3 corporate airplanes owned by Space X. There is some overlap, but it's the same as loitering in front of one of his companies HQ might help you find him.
Because it's public information that's literally broadcast to anyone listening by every aircraft above a certain size/speed. This isn't information that is considered secret or even that one needs to dig to expose, the aircraft is actively transmitting regular messages containing its location, heading, and speed to anyone within radio range which can be tens or hundreds of miles depending on altitude.