Phones - usually obvious but not obvious enough, so yes I am for making a big red undeniable record indicator. Cameras - they either show footage or take footage, so easier to understand. Security cameras - they usually put up a sign when you're entering a recorded zone, yeah we should make it obvious.

Pre internet it was not interconnected, having it so easy to connect data gives too much power over people's lives. That makes the problem worse, but giving you a choice to chopse what you do and say when recorded is crucial in my opinion