you can day trade futures (ignoring newer cme e micros) with a $500 deposit and its an awful idea for a plethora of reasons, but grown adults do it day in and day out blowing out over and over. its clear this leverage needs a little more oversight.
i will note however, i found myself over leveraged in an options position in august 2015 using TDA, and my account went very negative as the platform went completely down for the entire day and no automated or human risk liquidated it on their side..
I was trying to get some hedges in as soon as ES opened limit down again and i did manage to get a few off. ToS data was nearly instantly frozen so I was using another feed to gauge my orders. I digress with thinkorswim is not good for heavy intraday (and the market data is pretty bad anyway).
after this event, i changed brokerages and focused 100% on day trading and make a living, so it wasnt all bad i guess!
I can only image robinhood has no risk desk, or automated system that do not work correctly for non-trivial option legs
[1] - https://www.bloomberg.com/opinion/articles/2019-11-05/playin...