Falling for Ponzi Schemes and realizing it after all your assets have been taken away by the heartless people behind those beautiful surface, we can't really know if they're still out there doing the same thing but the only thing we could do is prevent those from getting us. We must learn all the signs of a possible schemes, learn to study a project or a platform first or you'll end like those victims of Bitconnect and OneCoin.
Maybe this article will help: https://kucoinblog.com/crypto-ponzi-schemes-bitconnect-onecoin-sk-st 