Adverse selection goes both ways. If PFOF leads to adverse selection against your flow then it's not win-win. You might say you are willing to trade of adverse

Adverse selection goes both ways. If PFOF leads to adverse selection against your flow then it's not win-win. You might say you are willing to trade of adverse selection up to the cost of the fees, but then you are trading a known fixed fee for an unknown stochastic penalty. And also who sets the fees? The entire thing is adversarial and it's really just a choice of game you choose to play.