Either balls of steel or owners playing as they know server seeds. It's a nice business model, wait a bit for some people to lose money, site profit rises, attracts investors and then BAM man with "balls of steal" (or server seeds) shows up and takes 60btc.
Owners used investors money to attract players and collected all the profit instead of investors.  Not saying this happened, just saying it is possible, this is not JD and Dooglus is not controlling bets so anything is possible.