_This aircraft (xxx) is not available for public tracking per request from the owner/operator._
Which proves my point.
A motivated stalker will dig in and research but that’s inevitable, but the other 99.999% losers will self-limit to whatever is available for the minimum effort.
This translates to harmless yelling at clouds, unless some cheeky troll does the homework for them.
Build a receiver with a Raspberry Pi
For under USD$100 / EUR€80, build a Raspberry Pi with a USB ADS-B receiver that can run dump1090 and PiAware. View data locally or via FlightAware Users that share data with FlightAware automatically qualify for a free upgrade to an Enterprise Account.
Perhaps you've forever lived in an academic/industrial bubble, but a significant part of the population and definitely the vast majoirity of those that would engage in taking a virtual confrontation to IRL, are borderline illiterate, have significant difficulty parsing simple manuals. You're describing setting up a computer with Linux, configuring an SDR and configuring some software to parse the data stream.
To most people, that's lunar...
Let's see if its really that simple, reachable and affordable such that any mildly disgruntled oaf can do in an impetus.