The root cause of non-standardization is that domestic foreign exchange is an agent, and many of them are even liars. They use fake software to deal with customers. How do you think you can make money from him?
Let's go back to the essence of calling orders. You can earn a lot if you do well, but the problem is that domestic calling orders don't bear the losses for you. Real transactions pay attention to probability and capital system, so calling orders themselves is not reliable.
Those who really make money are all getting rich silently.
I hope it helps you!