If you read the linked article on virtu trading, the only way it achieved its results was because the market consistently rose. If bitconnect is the same, it will fail in the event of a down turn in the price of bitcoin. As the market has been rising this year and they pay out returns in dollars not btc, they could have prob just held the btc and sold it when needed to make redemptions! They would still make a profit. Let's see what happens if the price of btc crashes for a sustained period