For some context on why this sort of side channel is routinely effective in banking but the front door is frequently not, see: https://www.bitsaboutmoney.com/ar

For some context on why this sort of side channel is routinely effective in banking but the front door is frequently not, see: https://www.bitsaboutmoney.com/archive/seeing-like-a-bank/ https://www.bitsaboutmoney.com/archive/seeing-like-a-bank/