Don't carry phone, don't carry smart watches, rings or other crap that uses Bluetooth.

Don't drive car, but if you must, at least disable Bluetooth service (there's an option, as that is another signal besides license plate that can be picked to by other people's cellphones)

People don't realize how much surveillance Google and Apple already created.

No.

Not from the camera.

If you want to avoid being digitally scanned, leave your phone home.

But stupidly high powered UV lights might be enough to turn you into either a white or black blob to the camera, if you made something like a crown with 360 coverage.

Call it active jamming.

The difficulty would be in figuring out how bright you need to be in UV, to overwhelm the sensor, at what range, in what lighting conditions, in a way that would hopefully not also blind people.