Number plates are just one of the privacy tracking technologies. Any modern connected car infotainment system will report and have that data sold or anything that has Bluetooth can be tracked.
Including the camera and microphone in our pocket that pings every cell tower every time we move.
Recent car tracking discussion here https://news.ycombinator.com/item?id=46097624
To an extent this data is within our reach to stop (buy old car, unplug cellular modules, etc). With ALPRs the only option is moving.
Bluetooth? You're overthinking this. We've been mandated to carry 4-5 transmitters per vehicle broadcasting their UIDs at 315 MHz since the mid 2000s:
https://en.wikipedia.org/wiki/Direct_TPMS