1. Sure, I agree that nothing is actually no risk, but this is close enough that I can call it that comfortably. I have zero doubt that he would make things right no matter what, based on past experience and knowing him well.

2. I have negative money there, so I'm not worried about it. Even if I had positive money, there is SIPC coverage of both securities and cash.

3. I would never get into a situation with a single point of failure. IBKR could die and I'd be fine. I don't mind the extra step of having to liquidate something in the extremely unlikely event that IBKR disappears.