Concerned about privacy?
Concerned about privacy? Install UAT. Turn on anonymous mode and go flying. If you fly without needing to talk to ATC, stay in anonymous mode and forget about it. That solution is available now. Perhaps there will soon be private icao codes for ES transponders and those so equipped will have an option to not reveal their identity to the world.
1990 RV-3 (now apart, upgrades in the works)
1959 C172 O-360