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A criminal human probably can't do a perfect voice impersonation of your teenage kid or frail grandmother who desperately needs to be sent money for some urgent reason.

Sure, but that’s not too different from the current scams where there’s some excuse you can’t talk right now. In both cases it can be solved by checking if it is coming from a known number and calling the person in question to confirm.

People you know typically won’t desperately need lots of money with some elaborate story that is impossible to be immediately confirmed.

If AI suddenly leads to an increase in call spoofing, that’d be a problem of the phone network that we already face with robocalls, but wouldn’t be new.

It's the cost factor. Using AI, it's economically feasible to contact a million people, even if only a fraction bite. Not unlike the current spam calls.

You can automate it and reach many more victims than doing it with humans.

Edit: it reduces the cost of the attack and thus makes it more profitable.