Robinhood has a little note during new account setup about how your account will default to being a margin account.
They don't show any of the details on the main screens after that, though.
Normally, it doesn't matter because Robinhood eats the tiny margin cost for the customer. They make up for it by selling the order flow. This only works as long as interest rates are low and, importantly, they can get enough credit to cover it all.
In times of unprecedented volatility and unprecedented risky trading behavior, securing that debt becomes non-trivial. Robinhood's debtors have no desire to be left holding the bag if something blows up.
They don't show any of the details on the main screens after that, though.
Normally, it doesn't matter because Robinhood eats the tiny margin cost for the customer. They make up for it by selling the order flow. This only works as long as interest rates are low and, importantly, they can get enough credit to cover it all.
In times of unprecedented volatility and unprecedented risky trading behavior, securing that debt becomes non-trivial. Robinhood's debtors have no desire to be left holding the bag if something blows up.