Surely I misread the title. The wounded were all stabbed, surely. Nope… Cops open fired hit the suspect, 2 randos (one of which was hit in the head), and a friggin cop. All started by suspect not paying the fare. Cops made the whole situation infinitely worse than had they not showed up.
A fundamental flaw in this, is it still involves user data, even if “anonymized”. You can advertise without any user data. We do it all the time. Does a television channel know your gender? Does a radio station know if you bought a car recently? Does the newspaper know your hobbies?