Because it isn't an either or scenario. I'm sure they are concerned about not having a chair when the music stops. But their relationship with Citadel (who has

Because it isn't an either or scenario. I'm sure they are concerned about not having a chair when the music stops. But their relationship with Citadel (who has been fined for thing like frontrunning) can't be ignored. All their incentives go in the opposite direction from their users.