Right, I'm saying the exchange isn't actually solvent. The "cash balance" on the fraudulent buyer account wasn't backed by any actual cash deposit or proceeds f

Right, I'm saying the exchange isn't actually solvent. The "cash balance" on the fraudulent buyer account wasn't backed by any actual cash deposit or proceeds from BTC sale, it's just a column in a database table. Theoretically, the exchange buys up a bunch of BTC with non-existent cash, raising the price tenfold, until their real cash deposits are too low to meet withdrawal requirements, then they do as the grandparent post says and disable withdrawals, deposits, or freeze the market until they can get it under control.