Ive said many times that AI could be used to enormous human benefit. Its just a huge and unreasonable privacy nightmare to implement. For example, imagine how much better the traffic in major cities could be if lights and speed limits were all controlled by an AI coordinating and tracking every cars by gps. Adjusting speed limits and diversions to maximise flow. Or being able to inform everyone on a highway that there has been an accident ahead immediately and adjust the speed limits accordingly.
If you can cut every cars driving time by 10% it would be the same emissions wise as taking 10% of cars off the road, save millions of man hours in people sitting in traffic... I just have zero faith that the information you could extract wouldnt be abused.