I was the initial developer on a system where the customers gave us access to their bank account and we would use their transactions to come up with (ultimately

I was the initial developer on a system where the customers gave us access to their bank account and we would use their transactions to come up with (ultimately) an overall credit score. Not just read-only access: their username and password. I was sure that would never fly. I was wrong - they had at least a few thousand customers in three months after launch. I don't know if that's a success, given the US population, but more than the zero I expected. So... I think convenience trumps even bank account privacy.