Since before you write your post you could not fully understand the rules of Ponzi where it is directly written that they refuse to own a smart contract and as a result can not escape with the money of depositors
Actually all people can lose money. Lets say there are only 2 depositors(lets call them D1 and D2) and 0% fee:
D1) invest 1$
D2) invest 1$
D1) receive 2$
D1) reinvest 2$
D2) receive 2$
D2) reinvest 2$
Both depositors are now waiting for 4$ while there is only 2$ in the "game".
See? Everyone loses, fee is irrelevant.