It is a multi level marketing scheme, until new members keep on arriving after you, the contract will keep you paying money and once no new users come to the contract the contract will fall and along with it the scheme and payouts too. The same was once with a game on the Ethereum blockchain where you had to be the last one person depositing in that contract when the timer was at 30s and once a person deposits in that contract the timer would again increase by adding xseconds where the value of x was always a constant and this contract too attracted more than 7k Ethereum at once in the prize pool.