Did you even watch the video? TP explicitly states that IB is solid with 9bn of risk capital backing its obligations to customers and clearing houses plus automated risk control systems.
I don't agree that it's IB's responsibility to protect the integrity of markets and shut down all trading but his point about the systemic risk that brokers (and clearing firms) without big balance sheets pose to the clearing houses is spot on. Where do the 15bn of losses from short GME options sit? Can the customers all make good? Decent chance that some smaller firms that clear with the likes of Apex, Pershing, Wedbush suffer losses from unrecoverable margin debt and there's not much cushion along some of these chains.
There is NO systematic risk if all brokers take cash-only trades and no shorting with shares. Then there would be no risk of not being able to meet obligations from the buy-side especially from the retail level. Then if there is still risk, then it would be on the MM's side and that's not our problem. They've made enough from us. They should be able to make good on their side.
There is NO systematic risk if all brokers take cash-only trades and no shorting with shares. Then there would be no risk of not being able to meet obligations from the buy-side especially from the retail level. Then if there is still risk, then it would be on the MM's side and that's not our problem. They've made enough from us. They should be able to make good on their side.

Did you even watch the video? TP explicitly states that IB is solid with 9bn of risk capital backing its obligations to customers and clearing houses plus automated risk control systems.
I don't agree that it's IB's responsibility to protect the integrity of markets and shut down all trading but his point about the systemic risk that brokers (and clearing firms) without big balance sheets pose to the clearinghouses is spot on. Where do the 15bn of losses from short GME options sit? Can the customers all make good? Decent chance that some smaller firms that clear with the likes of Apex, Pershing, Wedbush suffer losses from unrecoverable margin debt and there's not much cushion along some of these chains.