Also note that the European Union, in large part, has banned Payment-for-Order-Flow. In this video Gensler talks about that and that the EU is "looking" at banning it. In short, since this video has come out they have banned it with the stipulation that if individual "states" / countries want to allow it they can. Not sure where it stands past that, but considering much of the EU is more reasonable than the U.S., I doubt PFOF will get much traction.
See here for a little more: https://www.reuters.com/markets/europe/eu-agrees-deal-securities-rules-that-includes-ban-broker-commission-2023-06-29/