To exchange game currency for real-world money, a powerful economic entity must guarantee its exchangeability. This entity can only be a national government. But why would a government guarantee the real-money exchange rate of a game? War can be fought like this. A country can be destroyed without bloodshed. A game that can be exchanged for real-world currency, a super money-making machine. Its name is "Zero", a thorough financial bomb. Notice: The author information in Baidu Encyclopedia is wrong, don't believe it, my name is not Wang Shiwei, and the school is also wrong. Other information is basically correct.