Not necessarily for either point, much as I want to avoid being pedantic. My LG CX's remote uses IR for turning on, but beyond that it uses Bluetooth or some s

Not necessarily for either point, much as I want to avoid being pedantic. My LG CX's remote uses IR for turning on, but beyond that it uses Bluetooth or some similar protocol. Even if a remote is IR, rear cameras are often shielded against it. Front cameras, usually not. This is much easier to notice on IR-powered PC mice of course. Not sure if modern ones use IR as well - haven't checked.