My coworker used to be a teller at a bank. She said it would happen once or twice a week. And they could caution the person against the transfer, and tell the person that they’re being scammed. But legally, it’s their money and if they want to give it to some random person halfway across the world, that’s their legal right.

The tellers couldn’t outright refuse to do the transfer, because the account holder is the one who has the ultimate authority over where their money goes.

And every single time, the person would either:
A) be back again a day later, begging for their money back, or
B) be back again a day later, insisting on sending more money to the scammer.

Because if the scammer has a good mark, they’ll continue calling that same person to continue extorting money out of them. Because if you have someone who is gullible enough to fall for it once, they’ll likely be gullible enough to fall for it again.