1) acceptable behavior
2) enforceable, practically
I think video recording laws are largely influenced by 2).
I can angle my Ring camera to my smoking hot neighbor so I can record her doing yardwork. Creepy AF (breaks rule 1) but at what angle is it not obviously deliberate? Turned 10 degrees toward her lawn? 30?
Point being, I think US recording laws are too liberal but we need a defineable limit for privacy.
Maybe photon distance? Capturing photons traveling further than 30m into the aperture is invasive? (half kidding)