You can make the camera blind with a sticker or one of those slidey cover things, although it's much more annoying since that fad of cut outs for cameras has started.

Also, like I said in the other comment, my phone isn't attached to my chest like a body cam and constantly in a position to film everything in the room. If the NSA wants to see my feet, the ceiling or my face, they are free to do so.

Except if the OS is open-source and was proven to not have such spontaneous functionality.

The fewer devices listening in on me, the better.

Sure, but at least my phone doesn't have a wide-angle lens that could be constantly filming everything, because it's attached to my chest.