Thinking about it some more. For Camera and Mic they could have the option to "ask the user" every time and revoke that permission if the top is not the front a

Thinking about it some more. For Camera and Mic they could have the option to "ask the user" every time and revoke that permission if the top is not the front app after a minute or so. That would at least prevent using the camera and mic when the user has not recently given permission. Whether people would use it or not I don't know. I would.