>>xairy+(OP)
Arguably a much, much bigger problem are the (many) microphones of modern devices.
These usually get neither an LED nor a switch, and unlike cameras can't easily be covered, nor pointed away from potentially sensitive topics/subjects.
>>lxgr+T2
And having a microphone in the same chassis as the keyboard would make creating a keylogger easier. A microphone in the same room as the keyboard can be made into a keylogger[1].