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Don't do this. 99% of these services are scams. Also be aware of investing in dicing websites.
Be aware of investing in ANY websites*
And Ponzis aren't scams. They are schemes. A scam insinuates you didn't know the risks beforehand. Everyone investing in a Ponzi knows what they're doing, as well as the risks. Claiming they're a scam is like saying every casino in the world is scamming, as are all poker sites. They're not: you know the risk.