I really really think there is a typo in your post, i hardly believe you deposited 13 BTC in a website, just like that, with no background check and so on.
If its true, its your own fault ...
We don't know if he did some background checking regarding this site. Since Etude is just a guy that open his account in bct and then log off. And I can see on his post that he is just trying different gambling sites for his personal interest.