"Its open source data!" So are the (perfectly legal) doxes on Kiwifarms, yet that's one of the largest reasons its vilified.
Additionally, I doubt most people here would be okay with another person very closely watching your movements including this kid if Musk decided to beat him at his own game by setting up cameras around his house (Funny what you can do with enormous amounts of money). Musk is still human whether you like billionaires or not. You'd think that a place like this would be more privacy-oriented and wouldn't be okay with any kinds of telemetry period, or at the very least would want it handled more carefully (Plane data handled by in-house FAA units rather that broadcasted to the web for anyone and everyone to see).