By the end of 2021, an estimated one billion surveillance cameras were in operation globally; 54 per cent of them are located in China. Chinese cities are under the heaviest CCTV surveillance in the world, but there's growing concern about the surveillance tactics, and lack of data protection, in several countries.

Two exceedingly popular European security camera brands found in Europe, Germany specifically, are Bosch and Mobotix. Funny enough, whereas many security camera brands choose China to manufacture their devices, Bosch chooses the United States to produce their devices.

Having someone constantly monitor a camera feed, or even comb through recorded footage, is usually a fairly big business expense. That's why you can assume that a lot of those cameras out there don't have anyone at the other end, and much of what they record may never even be viewed by human eyes.