The STP (Straight Through Processing) is the simplest. The banks quote a raw price and the spread is increased to provide the broker commission.
The outcome is neutral to the broker except of course that when the client is successful their trading volume will rise, the money is more likely to stay in the broker’s bank account earning interest.
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The costs of holding such an account are higher, the leverage lower, and the access to market not as great but you know what you are getting all the time.