Community bank near me does it because they had a number of folks who were getting scammed via some scam calls (family member in jail scam, fake IRS scam, obvious scam 'investments' and so on).
They've stopped a handful of scams just by asking the customer what they're doing. For a few of the folks involved the amount of losses would have been devastating financially and certainly emotionally (they're elderly with very limited finances).
I know the usual 'the bank wants to sell you something' lines will come up, but it's not hard to just say no, and the teller there might not be Snidely Whiplash...