Robinhood operate on razor-thin margins and if you just look at where three-month implied vols were trading in early Jan, we are in a 7-sigma event. To be fair

Robinhood operate on razor-thin margins and if you just look at where three-month implied vols were trading in early Jan, we are in a 7-sigma event. To be fair to Robinhood, it is probably hard to anticipate and prepare for such an event when you're not charging commissions. They are not the only brokerage that has had problems in the past seven days. And they lose money when their customers can't place orders. "You should assume you can reasonably control your assets at any given time." Sometimes you can't reasonably control your assets, because you can't control them at all. So you shouldn't assume that you can reasonably control them in those times. I hope it is clear that I am not trying to be argumentative; I actually think it's a complete let-down that Robinhood has left so many people frustrated as their wealth whip-saws around in the market. I'm just saying that tail scenarios don't usually fit into our predictive model of what's "reasonable," even when the solutions seem crystal clear in retrospect.