It’s a completely arbitrary and unnecessarily punitive system. It’s akin to robbery. I once was overdrawn by 19 cents and was charged $30 for the overdraft. I wasn’t notified of this until three days later when I received notice in the mail. Imagine what could’ve happened during those three days. I had an automatic deposit that was already showing as pending on my account which was credited the very next day after the overdraft. When they have the right to do this, it’s essentially a loan where they are allowed to charge you a completely illegal interest-rate. This is nothing more than legal robbery.