> Those numbers at the bottom of a cheque? Yeah, they include your account number.
Yes, as well as the routing number.
> There's no inherent information risk to giving out an account number …
Of _course_ there is. In the US, the account + routing number is sufficient to perform a ACH transfer, write checks against that account, etc.
The risk is enormous.
> Especially when one considers the accompanying fraud risk thereof.
I’m assuming you misunderstood the risk when you wrote the above. It is, in fact, extremely high.