>That implies Robinhood was letting customers trade without having the necessary funds in their accounts.
They were playing fast and loose with margin accounts. There was a youngest who committed suicide over an incorrect margin call of in/around $700k- saw it on WSB. AFTER his demise a correction notice was issued.
Sauce- WSB, not a chance I could find it again only browsed the site a few times. Most of them are woefully ignorant about calls/puts/straddles- basically all of it.