What you say makes sense. The problem is private data is being used for public services too. Without express opt-in and without as you say any disclosure. There is almost no private space anymore in cities. Weather via in-house speakers (microphones), door cams, gps location and the like. All data is fed back to law enforcement or whatever reason they label it.

Personally hope we see pocket scrambling technology being normalised. Rather than you having to stand out from the crowd with clothing or being manipulated to opt-in, it would be opt-out by default. Many electronics would be built to handle people going dark and not working for a few seconds/minutes. An actual investigation and real old-fashioned police work would be warranted if they were to be used for ulterior motives.