If you could invest and earn 2% daily interests on your Bitcoins or USD without having to buy their shitcoin first and getting paid in their shitcoin then BitConnect would be a ponzi/scam. Right now they could decide to take no more loans and afford to pay everyone with their stash of millions of BitConnect coins, but when people tried to sell theese BitConnect coins the value would quickly drop to 0$ and most people would get screwd. BitConnect would still have all the Bitcoins without having scammed anyone, people just scammed themself for taking a shitty deal trading their Bitcoins for Shitcoins.
I don't see how paying out in worthless shit would make it not a scam. Otherwise every scammer could pay out in rubles or bolivars or dogecoins and avoid any responsibility.