> I understand people often like to express extreme positions on the Internet, but I think it's pretty easy to see an ideal society has rules somewhere in between "you're not allowed to know your customers" and "you can't accept a penny unless the giver does a blood draw in front of you and is confirmed to be in a central register of DNA".

Yeah. This often results in ludicrous positions.

On the other hand, EFT flattens scale. Physical cash gets harder to handle in large quantities. Electronic money does not. It's equally easy to transfer a billion as a cent. So it's hard to get situations where small amounts have privacy and large amounts have scrutiny.