That's not true. The financial system does not primarily rest on technical safeguards. It rests on legal safeguards and risk management (i.e. it puts the onus t

That's not true. The financial system does not primarily rest on technical safeguards. It rests on legal safeguards and risk management (i.e. it puts the onus to strike the balance between security and convenience on the company in the best position to decide what's a legitimate request). If I have read-only access to your bank, or to Mint, or if I can steal your mail, and I've ever received a check from you, I can set up an ACH relationship with my broker. I could probably even pull money out of your account. The transfer would be quickly reversed, and I'd be easily caught.