Not directly related to the article, but the other day I saw the "camera in use" indicator in the Android status bar while WhatsApp was open. The camera usage history showed it was being used by WhatsApp at the time (not another app), but I wasn't making use of any feature that required a camera at that time (browsing contacts).

I doubt it was nefarious. Anyone know why something like this would happen? Is there some internal calibration going on or maybe a bug? I disabled WhatsApp's camera permission immediately afterwards.