Because Elon has continuously misrepresented this:
The data used for flight-tracking accounts like ElonJet - called ADS-B data - are transmitted from nearly every plane in the sky.
The signals are unencrypted, and anyone with a $20 RTL-SDR radio can pick them up. Aviation hobbyists gather the data and put them on websites like ADS-B Exchange.
It's publicly available, legally acquired data of the kind Elon Musk said he'd allow, until suddenly he no longer did.
And it isn’t even Melon Head’s. It belongs to a shell company Falcon Landing LLC located at SpaceX HQ. And SpaceX …not Melon Head - is listed as the agent and manager along with 2 other planes in the fleet.
And he can’t be on all 3 at once…and that rather points to several people using them
https://talkingpointsmemo.com/edblog/its-not-musks-plane-it-belongs-to-spacex