Big time doubts, too high rate and no explanation what will they do with the money.
Dice bankroll I assume.
I've suspended my withdrawals from the website and let it earn interest until the end of the year, and maybe start promoting again to gain some more referrals.
I see the first effects of this idea ^^

Is not that clever? People wanting to save Bitcoin and earn Bitcoin (this annual 4.08%) deposit them in gambling service! He is genius!