I got quite a few comments on Friday’s post about starting a disruptive bank that questioned how such a bank could make money without lending, especially given that many bank accounts advertise that they are “free." The answer has to do with the fact that there is no such thing as a "free” account, there are just accounts with hidden fees, which come in three guises: first, being grossly overcharged for certain activities (like automatically moving some money between accounts to cover a payme...