Quote from JangoFolly:
You are incorrect. The OP is asking about exchange-traded e-mini contracts. Except for execution, clearing and platform fees, neither introducing brokers nor FCMs make or lose money when traders lose or win. This may be true of OTC forex where the introducing broker is taking the other side of your trade; however, for exchange-traded products the counterparty is always another trader.
so is this the advantage between futures over forex, which is the specialist is on your side?