Earlier quoted context omitted.
It's as accurate as it is inaccurate. Had Robinhood not been able to find hundreds of millions of dollars of cash that day, they would have been declared insolvent.
I don't think that's true. They raised the additional capital so that their customers could continue buying shares of those 8-50 companies. Had they not raised that capital, they would have just had to keep blocking those buys, but they would have been fine otherwise.
This is not my understanding. The 3AM phone call was a collateral call. That covers existing trades.
As a clearing broker, when they sent in the trade they created the liability.