"Afaik robin hoods business model is to sell the trade data from its users to day traders who can manipulate the stock" They sell access to their book to marke

"Afaik robin hoods business model is to sell the trade data from its users to day traders who can manipulate the stock" They sell access to their book to market makers, if that's what you mean. They benefit from the extra liquidity, and Robin Hood customers benefit from better than market rates. Plus trades are publicly available data. And it isn't clear how having that data would be beneficial to manipulating the stock price. Edit: Here's a decent write up of how it works https://medium.com/automation-generation/commission-free-trading-is-it-helping-or-hurting-you-dc5fdc22ca6a https://medium.com/automation-generation/commission-free-tra...