[chrisseaton]

> If someone knows your account number, they can take money from it

You can seriously just say a bank account number at a bank in the US and walk away with a bag of cash from it, with no other security checks at all?

In the UK they’d make you enter a password or PIN or use 2FA.

[ixwt]

No, you would have to do some authentication at a physical bank itself.

You can use the numbers to request a wire transfer from the account. In fact, when you're setting up an ACH transaction for bills and such, they tell you to get the numbers from a check.