The large brokers more or less did not care when robinhood did the same thing years and years and years ago.
- https://fortune.com/2020/07/08/robinhood-makes-millions-sell...
For smaller trades that's charging 99+% less than their competitors at the time..
The concern is that when market makers share that profit with brokerages they encourage brokerages to select the market maker that gives them the biggest cut rather than the one who gives the best price for the trader. Still, the trader will never get a worse price than what's available on the exchange. (That's also illegal.)
That's literally not payment for order flow works, and it's illegal under regulation NMS.
It’s similar to a casino offering free hotel rooms to people who play blackjack but who do not know how to card count. They even offer 3/2 on blackjack instead of 6/5.
I'm not a robinhood fan - I moved all the investments I had out of their years ago. But, to think they are the only one selling order flow is disingenuous
So even if "it's not really free" it's still a significant discount compared to the pricing that was standard before RH came along. Opening up investing to more people by making smaller & more frequent trades feasible seems generally good to me.
I will admit that other aspects of Robinhood's business such as the degree of gamification are still concerning, though.
Any investor can get 0 now with good brokerages or use something like IB for cheap trades on otc or foreign stocks in small amounts.