Before revision: Hardware kill switches are already available and widely tested on the PinePhone, Librem, SHIFTphone , to cut power to the input peripherals (microphone, camera) but also the network connectivity modules (wifi, cellular network).
After revision: Hardware kill switches are already available and widely tested on the PinePhone, Librem, Shiftphone , to cut power to the input peripherals (microphone, camera) but also the network connectivity modules (wifi, cellular network).