The Crypto market has grown into a huge opportunity market, providing a means of token to solve the Cold Start Problem. In particular, the recent "xxx to earn" projects have benefited a lot. If you walk around Twitter for seconds, you'll find dozens of "xxx to earn." And most of the "xxx to earn" becomes impossible to "earn" and is silently withdrawn from the market. Why is "xxx to earn" impossible? and how to make “xxx to earn” sustainable? The answer is in the inflow. Users who partici...