Bitconnect is indeed a classic Ponzi scheme. The only reason they've managed to survive this long is because they created the program right at the beginning of the bull market. Their tokens have a market cap of $1B+ (which is all money they created). They also have a lot of exposure to BTC prices because their token sales are in BTC, and many deals are settled in BTC.
So yeah they were just extremely fortunate to be in the right place at the right time. They will still collapse eventually. If a bear market comes about, the collapse will happen quickly. If crypto continues in a bull market, then it could take awhile. But rest assured this is a game of musical chairs that is stacked against you. They will walk away soon.
You make some, and lose some.
