Sending letters asking people not to do something is also very legal. Also, stalking and/or laws are entirely unrelated to whether or not ADSB data is legally

Sending letters asking people not to do something is also very legal. Also, stalking and/or laws are entirely unrelated to whether or not ADSB data is legally collected. It's a different issue entirely. It's legal to look in a phone book, but that doesn't mean you can't harass someone over the phone.