That is a very nice challenge, I think I will give it a shot. But what if this site is not going to pay me???
Are you referring to the twitter challenge? The prize is smaller than the challenges that you can find in this forum. You may read or at least ask some of the participants, I myself always get what I won (you may ask others if you doubt with what I say). I have no issues in case of payment/withdrawal, it is always fast/instant.