Re: What would you do if your bank…
This is true. Money erroneously deposited to your account which you know is not your own cannot be spent or withdrawn by you - it is considered to be theft.
However, let’s take the case of the New Zealand couple who received millions in a bank error and managed to withdraw a sizeable amount before the bank realized its error. The error was so large they had enough money that they could run away. Mind you, they’ll be on the run until caught, but with that much money they can buy new identities.
The scenario is a moral dilemma - do you keep money that’s not your own, and what about the repercussions of such actions, does it even matter?