When the cameras and processing are good enough, the watchers may also know your heart rate, breathing rate, who you glance at that goes by and which ones raise your heart rate, when you smile, when you frown, your pupil dilation, what items you browse in physical shops even if you don't buy, everything that can be picked out by lip reading, whether you look like you got a good night's sleep; trends in all these factors over time as they see you from multiple cameras across the months and years, and can probably predict when you will lose your job and if you're getting a divorce before you, your spouse and your employer knows these things, and which cancer you have before it's diagnosed (but will use it to raise/deny your insurance rather than actually help you).

Of course it will all be presented only to trustworthy researchers with impeccable standards of ethics who have your interests first, such as the advertising unit, and the ministry of happiness and fair opportunity for all.

All data requests from law enforcement fishing crews, "surgical" tactical vote manipulators, blackmailers, credit reference agencies, insurance companies, pre-crime detection centres, and religious morality police will of course be turned down, as that would be unethical. No price could possibly be high enough...