For the most accurate formula to calculate Futures trading fees, it is as follows:

Coin volume * Price * Fee rate = Trading fee

On Binance, the fee rate is 0.02% for Limit orders and 0.05% for Market orders. If you execute a Long Market order with a volume of 0.01 BTC at a price of $100,000, the trading fee will be:

0.01 * 100,000 * 0.05% = $0.5

Assume your stop-loss is at $90,000. When the price drops, another Market order will be triggered with a trading fee of:

0.01 * 90,000 * 0.05% = $0.45

In the case where your target price is $110,000, when the price rises, another Market order will be triggered with a trading fee of:

0.01 * 110,000 * 0.05% = $0.55

The trading fees collected by the platform are used to cover their operational costs. They may reinvest these fees into their system or use them for personal purposes. This is a basic principle of business and is entirely normal.