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Why do stock brokers charge fees
They are providing you a service and they charge you for it. The service includes giving you a trading platform(website and the infrastructure), doing all the background work for setting up services for you, relaying your orders to the market or as a broker fulfilling your orders, doing settlement when an order is matched, giving you access to the stock market(the costs are quite high to get a license to relay orders to the market and I believe it needs to be renewed every year). There are transaction fees which the stock exchanges charge the brokers to use the stock markets infrastructure and connect to it. And then interfacing with banks for monetary transactions and also doing according to the law in the jurisdiction they are located in. Most of it is an one time cost, but they are a private enterprise out to make profit so they will charge for their services.