Have you gone through their rules, terms and condition to be sure that it isn't indicated or is indicated there??
If it is then you have to abide by it to be able to get your winnings..
It's a good thing anyway that you got your cash regardless, just ensure to read through websites next time so you don't get into confusion.
Most probably he's right here and that's why the site processed his withdrawal, though its not that big but at least they make it right and hopefully not just because of this forum but also because they are really a legit. Though usually the site really ask first for you to wage some amount before you withdraw money, maybe this is just part of the rules but its good that OP was able to get that free money. Waiting for more experiences about this site and some reviews, I might try as well.