Hurtling tons of steel through the sky at hundreds and hundreds of kilometers an hour above my head is a massive privilege to have, and a huge responsibility to take on. Letting the world know that you are doing it is very much a lowest-baseline expectation.
It's extraordinarily rare that a plane crashes into a house. What actions do you take if you learn that a plane is flying overhead? My guess is that even with this tracking data available you're completely unaware of air traffic near your house the vast majority of the time and that when you are aware you don't do anything at all in response.
And it is so rare because of the incredibly strict regulations and limitation on it happening. And I feel safe to ignore that data because I can trust that my safety is taken care of by those same limitations.
Those regulations and their effectiveness have nothing to do with your being able to personally track flights around you. Indeed those regulations were in place and effective long before there even existed a means for you to obtain the tracking data you now regard as somehow essential to those same regulations.
