Very interesting but one caveat: I doubt you would ever get the most relevant producers on board. There are dedicated spycam manufacturers and all the cheap China stuff to build into other things is probably what ends up being used to spy on customers. So little benefit to try and get legal or voluntary commitments if in the end many won't play along.
This is what happen in Japan. In Japan phones' camera must ring shutter sound on taking photo that's annoying on many situations meanwhile bad people use dedicated spycam that's silent of course.
