There is nothing wrong with the Payment For Order Flow model. Virtually every retail broker does it. What you're missing is that Robinhood is not the only comm

There is nothing wrong with the Payment For Order Flow model. Virtually every retail broker does it. What you're missing is that Robinhood is not the only commission-free brokerage. I'm sure you'd rather have no commissions and 80% of the price improvement instead of no commissions and 20% of the price improvement. The real problem is that Robinhood advertised they have THE BEST EXECUTION compared to other brokers, set up a Committee to ensure they have THE BEST EXECUTION, and then that Committee somehow failed to notice that Robinhood clearly doesn't have THE BEST EXECUTION because they're taking an 80% cut of price improvement, instead of 20% like everyone else.