Part of the problem stems from the fact that it is legal to sell spy software.
It's just illegal to use it without permission outside the workplace, unless it is used by parents to spy on their minor children.
Stephen Bryen, Chairman & CTO Ziklag Systems Spying through smartphone cameras, computer webcams, laptops and tablets is widespread and governments have been checking people out for years.
Between 20, GCHQ, Britain's NSA, ran a program called Optic Nerve that scanned live webcam chats on Yahoo (and probably other chat services).
By being able to activate either a webcam or microphone on a PC, laptop or smartphone, intruders can listen in on sensitive meetings and conversations and even know where the meetings are held, who attended, and everything about what was discussed. It is of course illegal to record a conversation without obtaining permission of the person or persons being recorded, but keep in mind even web conferencing software allows for proceedings to be recorded and no permission is asked.