I don't think it's ponzi scheme. I have depositted from 4 different wallets and 2/4 of them are doing profit and third one getting really close. Overall winning about 0.7btc.
Do you even know what a Ponzi scheme is or how it works?
The fact the you have doubled your money successfully with this scheme is evidence *towards* it being a Ponzi scheme, not against.
The scheme will continue to pay out until required payments exceed new deposits, and then it will slow down and stop, leaving the most recent victims out of pocket.