People act like UAC leads to banner blindness but I don't think that really holds up.
In the mobile space you get prompts for soooo many things, and loads of people see "ask for location data" and say no when they think it shouldn't be used! The system works!
I see loads of articles about people talking around permissions. Much much more than for tools on desktop computers. I believe that the higher visibility makes people noticing much more likely.
Of course the hypothetical "don't care" person won't notice.... but definitionally they won't ever notice!
I think it's fairly undisputed that the little lights on webcams that are on when the camera is enabled has totally worked, and the location service blue bar on iOS has worked well too IMO.
In the mobile space you get prompts for soooo many things, and loads of people see "ask for location data" and say no when they think it shouldn't be used! The system works!