We're nearly at the "Foundation" levels of surveillance tech, but with no countermeasures in sight to oppose that. Even resisting web browser fingerprinting is difficult.
The days of open communication about privacy (lol) are long gone!
There is another way...
The only "countermeasures" we can have are "soft" ones - social, political and legal. Convince people to treat privacy as core value, and surveillance as repugnant. Make forms of surveillance illegal. Mandate by law to have surveillance capabilities in devices handicapped by design. But this, at best, only solves the problem for regular people and some of the time, while governments stay stable and sane - the possibility of deeper surveillance is still there, just the choice to perform it seems unattractive at a given moment.
This sounds like legislation. Mandate (with stiff penalties for violations) that any recording in the presence of a certain BLE advertised value (that's anonymized) means that all people should be removed from the scene with current image generation AI tooling? Not sure what to do about in frame vs out of frame, but perhaps this sparks something.