Cameras require light, while radio waves works almost as well in darkness.

A motion sensor is an extra device that needs to be connected, have power and so on.

There are already radio wave motion- and room occupancy sensors where you can specify zones and so on, but if I could have personalized on top of that I’d take it.

Finally, using a thing for something useful other than its intended purpose is kinda fun.

Well I heard about this and thought “this will be great for home automation”, but I also know that someone was equally excited about using this to rob people of basic freedoms or being a fucking creep or both.