From my experience in general aviation, I've never met anyone who intentionally turned off their ADSB. It is generally wired into the transponder, and the bulk of air traffic worldwide happens where a transponder is practically required. Yes, it is technically not needed but you can't get help from ATC, can't fly instruments in the clouds, and you can't fly high.
Sure, it can happen but these are edge cases. Space-based ADSB solves this problem with a fraction of the effort and much better data. Spooks might need this for military stuff, but for the bulk of planes, it doesn't make sense.
Sure, it can happen but these are edge cases. Space-based ADSB solves this problem with a fraction of the effort and much better data. Spooks might need this for military stuff, but for the bulk of planes, it doesn't make sense.