It's a very short one, yes.
What is the threshold for the privacy aspect of my data? Who chooses what is private and the limit of what can be gathered?
I'll give you a scenario in a smart city hypothesis. If I'm walking in the street at two o'clock in the morning, I hate the idea that the government will have my facial recognition and know that I was there at that specific hour with someone I may or may not have to be with. I do need my own privacy, and leave me alone.
However, if I become the victim of a hit and run, I do want all the cameras to get the son of a gun who got me, the licence plate, the picture of the driver and everything. I wouldn't care that much about privacy.
What's my challenge? Who decides what is and what is not private?