The broker is on the hook. In one case the broker rebated the customer but I suspect most of the time they'll try to collect through regular debt collection cha

The broker is on the hook. In one case the broker rebated the customer but I suspect most of the time they'll try to collect through regular debt collection channels. Example: https://markets.businessinsider.com/commodities/news/oil-trader-loses-millions-on-brokerage-glitch-2020-5-1029186688 https://markets.businessinsider.com/commodities/news/oil-tra... As the saying goes: If you owe the bank $100 that's your problem. If you owe the bank $100 million, that's the bank's problem.