In general, there are two ways for Brokers to make money. One is to charge a fixed commission for opening and closing a trade, the other is to
widen the Bid/Ask spread. Normally, you would either pay the fixed commission to the Broker, or you would pay the Broker through the Spread.
Most reputable Brokers offer Accounts with a fixed commission, where the Spread depends entirely on their Liquidity Providers, which
includes a number of Banks, as well as a "Dark Pool" consisting of Hedge Funds and some large investment firms. The more Liquidity Providers a
Broker has, the better the Spread.