This is a tactic scammers are using, it is simple that on the exchange youndonnit have full control over anycoin you deposit, that reward alone look too good to be real, if you deposit any bitcoin or any other cryptocurrency into that exchange, your coin will be gone, do not try it because that is most probably scam work and many people have been victims just this way. The easiest way to scam is to promise a free giveaways.