My first cynical take was that this will be used for "hunch laundering." There could be no indication that user A is an alias for user B, other than someone's h

My first cynical take was that this will be used for "hunch laundering." There could be no indication that user A is an alias for user B, other than someone's hunch, but getting a computer to say that they match might be good enough to get a warrant when someone's hunch wouldn't be. It would be similar to having drug sniffing dogs affirm their handlers' feelings.