Earlier quoted context omitted.
> though there are some reports that the stocks were bought on margin, which makes it more(?) okay, I guess? https://cdn.robinhood.com/assets/robinhood/legal/RHS%20Custo... 4. Liquidation. In the event of the death of the Customer, or in the event the margin in any account in which the Customer has an interest shall in either Robinhood’s or the Introducing Broker’s discretion become unsatisfactory to either Robinhood…
That's referring to margin specifically, not a held position. There's a difference between margin trading and holding the stock in your name.
So Robinhood technically is allowed to do this as per the letter of the law, and now the question is whether Robinhood is violating any fiduciary duties they have to their customers.