If you use LoJack or other similar programs for an older car, the tracking data issues still remain from what I can tell. That is how they find the car.
Yes, that is true, just like a cellphone. But at least it is not listening to everything you are saying like the new cars do. But you could put the LoJack on a switch. Turn it off when you are personally using it and back on when you park or worried about it being stolen.
Now want to know how to make a hidden switch? You mount a magnetic “Hall Effect” switch hidden behind a panel. Then you stick a magnet in the right place on the outside of the panel to activate it and switch it on. :)