In the future, the cleaning of decentralized exchanges and the expulsion of junk coins is an inevitable process. If it is not regulated, the disorder of the monetary system will only increase the instability. Only by establishing a healthy trading market can the normal world order of legal currency be satisfied. To put it bluntly, people must follow the logic of hierarchy. Not everyone can rely on luck to buy some junk coins like winning the lottery and get rich and then move up to a higher class. Society needs division of labor. But the dreams of the lower class and the new leeks cannot be shattered. The first element of investment is to avoid risks and ensure the safety of funds. This requires a lot of knowledge accumulation and experience summary.