PFOF is neither front running nor illegal.
If you are curious about a brokers position on PFOF you can look up their disclosures. SEC Rule 605, 606 and 615 are the search terms you want when looking these up. Fidelity has a similar disclosure on this as Vsnguard, which is that they don’t engage in PFOF except for some options markets.
Robinhood got in trouble for false advertising about PFOF not because they engaged in it, because again, PFOF is not front running and not illegal.
