If it is an informal platform, your money is only in their company, and you may not enter the trading pool when you open a position. To put it bluntly, gambling. If you make money, their company loses money, they make money, and you say they don't want you to make money. Most importantly, it's ok to earn a little. If you earn more, there will be various restrictions, and even directly find reasons to close your account. After all, it is not a formal regulatory platform.