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How does Robinhood stock broker make money?
Yes, there is a lot they are leaving out, and I would be extremely skeptical of them because of the "reasons" they give for being able to charge $0 commissions. Their reasons are that they don't have physical locations and high overhead costs, the reality is that they are burning venture capital on exchange fees until they actually start charging everyone they suckered into opening accounts. They also get paid by exchanges when users provide liquidity. These are called trade rebates in the maker-taker model. They will start offering margin accounts and charging interest. They are [likely] selling trade data to high frequency trading firms that then fill your stock trades at worse prices (Robinhood users are notorious for complaining about the fills). They may well be able to keep commissions low, as that has been a race to the bottom for a long time. But if they were doing their users any actual favors, then they would be also paying users the rebates that exchanges pay them for liquidity. Robinhood isn't doing anything unique as all brokers do what I mentioned along with charging commissions, and it is actually amazing their sales pitch "$0 commissions because we are just a mobile app lol" was enough for their customers. They are just being disingenuous.