LOL, it's evident from the very reason why these PFOF providers pay for the retail order flow. If you are a scalper, you are de facto making markets and are probably watching the tape very carefully. The market makers are trading with retail because it's uninformed flow and the market maker is unlikely to get negatively selected.when you say they have shown in the past they dont like scalpers or tixuc order flow where is or what is your proof of this?
As a result, they don't like people who are actively trading within the same time frame or, for that matter, anyone who can get them negatively selected. The worst case scenario is the type of trader that actually figures something about their approach and can manipulate them into doing things (e.g. a guy that's faking icebergs or something like that).
PS. It's likely that the broker (whose main source of revenue is PFOF) is monitoring the clients and tried to intimidate them into submission. The market maker does not really have the resources to monitor and complain about specific trades, but they do bitch and moan when their negative selection rates go up