How does Robinhood make money?
With Robinhood Gold, you get up to 2x your buying power and access to after hours trading for as little as $6 per month. This is the only product Robinhood charges you for, and is completely optional. Trading is still commission free.
Additionally, Robinhood earns revenue by collecting interest on the cash and securities in Robinhood accounts, much like a bank collects interest on cash deposits.