Please explain 'Ponzi Scheme', searched it on google, but, i couldn't understand.
I´m too lazy to explain, but in a short description:
You tell everyone that they will get their money back. You pay the ROI of the first investor with the capital of the second investor. After that they will maybe tell others and you pay off the investment of the second with the investment of the third. Because it works great, everyone is going to invest and all is fine till the OP / person at the top of the ponzi scheme exit scams. He can just take all the money with him and nobody sees his investment again.
A ponzi scheme can be noticed when someone can permanentily pay like a 30% ROI, in this e.g., over a week. And that for a stable amount of time as if he´s making money out of nothing.. because he maybe pays the ROI with the investment of the other guys.