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by lovehashbrowns 1971 days ago
But when you buy a stock, like just straight up purchase it, the cash is already there, on-hand, in your account. There's no Robinhood putting up their own money because YOUR cold hard cash is there, in the RH account. That is used for the purchase. So why stop people from buying the stocks?

This answers my question, I think: https://news.ycombinator.com/item?id=25951475