The thing that scares me isn't so much the violation of privacy. It's the idea that some computer algorithm can accuse me of a crime automatically with no evidence and generate an investigation. Judging by how police respond to these leads, you can end up in jail based on this "Evidence." While you wait for a 6 month investigation to be completed you lose your job and get an arrest record. Even if your photo is just…
The corollary to this shirking of responsibility is how it lets people, and not just law enforcement, justify abuse of whoever the system says is guilty of a crime, because after all, the company that made the black box says that there is a one in a trillion chance of encountering a false positive. Judges will throw the book at defendants because, statistically, the black box system is almost never wrong, and the system says the defendants are monsters.
But the most Kafkaesque part is that people will never get an answer for how these systems determined they were guilty. It's a trade secret, it's part of on-going investigations, it's critical to national security, or in Apple's case, it's literally illegal to look and find out how their system came to conclusion because viewing the data itself is a crime. These systems often inscrutable ML models, as well, and we all know just how buggy and error prone computers and software can be.