There have been all kinds of "Is it a Ponzi?" checklists around but the number one evidence it's a Ponzi scheme is that if they have so high returns, why the fuck would they pay out so much? Even an average Joe can take some credit card debt or a second mortage on his house and pay at most low double digits in YoY interest. Why would anyone, EVER want to pay more than that, and even advertize it as an investment opportunity if they weren't a scammer?
Because getting in debt means having to assume the whole risk and having to pay back anyway sometime. On the contrary selling trading shares you unload the whole risk and costs on investors and just skim profits. It's all stated in their small print which nowhere guarantees anything about the return OF any investment. Add to it that it's only them who write and keep their book, and it means that it's just a very risky bet based on their word, which might theoretically make sense, but looking at the too consistent payouts, joke of customer relations, and very lame excuse for the recent block of withdrawals now more than ever seems like a scam.