That is actually quite a simple-but-great idea that I hadn’t thought of.
In fact, I think three killswitches would be nice:
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A killswitch that disables all sensors and GPS capability - essentially anything that could be used for location services or monitoring disabled at the hardware level when flipped.
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A second killswitch that disables cameras and microphones.
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A third killswitch that disables all radios.
That would be amazing. I personally would have the first and second killswitches in the off position most of the time while having BluTooth disabled software-level. I’d only flip the third switch to disable all radios entirely if I’m really wanting to totally disappear for a bit.