How do I know my smart phone isn't shooting a video of me when I'm dressing? It isn't pointed at me. It doesn't sit on a stand with a view of the room. Sure the microphone might catch something interesting in the bedroom, but setting up an internet connected camera with a view is very different than than one that is pointed in a safe direction.

Firearms: never point it at something you don't want to destroy. Internet connected cameras: never point them at something you don't want the world to see.