Fomo3d has drawn intense scrutiny from the crypto community due to its design and its ever-increasing pot (currently at 94,000 $ETH). In short, the Fomo3d key works like a token that customers buy in order to add 30 seconds to a timer. The ether goes to a collective pot. If and when the timer ever hits zero, the last customer with the token will win the pot. That has not happened yet, and the pot continues to grow as of this time.