Something seems off here. The person would have had to have significant assets or collateral to end up negative; regardless of age and income. It just doesn’t work like that.
You're right, but due to Robinhood's terrible UI/UX, when you hold a spread and the short leg gets assigned, it shows your account as owing an astronomical amount. In reality, you have an opposite leg that gets exercised and you're only out the difference in the spread (which that risk is based on your account balance/margin/etc). This kid didn't lose $700k, his account just shows -$700k until Monday morning when it…
This story just got a lot more tragic... He maybe lost $10k. Maybe nothing at all.
Hell, he might have made money, but the RH UI just showed him this abysmal number.
Or there's more to this story. I would be interested in knowing how long the issue had been going on, and if RH support had been contacted.