On their homepage they say: "Open Free Boxes Win Real Bitcoins!", "Get the BTC winnings sent directly to your wallet! We process withdrawal requests multiple times per day."
And on their ToS page they say: "None of credits, balances or other rewards on the Website have real monetary value.".
This is something very intriguing, they are rewarding people with Bitcoin but they don't consider this with monetary value, a friend invited me here and I have 35 tries to open the box with surprises, but unfortunately I'm getting a lot of empty rewards I don't think I can reach their minimum withdrawal.