That's not at all what front running is. But to let patio11 answer your question: payment for order flow is useful in many ways. See: https://www.kalzumeus.com/

That's not at all what front running is. But to let patio11 answer your question: payment for order flow is useful in many ways. See: https://www.kalzumeus.com/2019/6/26/how-brokerages-make-money/ https://www.kalzumeus.com/2019/6/26/how-brokerages-make-mone...