Robinhood allows up to $1,000 to be used "instantly" just by the user initiating a transfer. So Robinhood doesn't have the money yet, but the user can buy stock

Robinhood allows up to $1,000 to be used "instantly" just by the user initiating a transfer. So Robinhood doesn't have the money yet, but the user can buy stocks -- meaning they are using Robinhood's money.