I don't know but for a contest worth 10 BTC, you should really set some rules properly. I couldn't find any rules and that's not a comfort for people wanting to participate. All it says is referrals must play 10 games but looking at the website, there's no one in chat and only 3 games available. Leaderboard is also not updated real time (I don't believe there is not even a single player referred).
And of course, proof of funds are needed. That's the bare minimum.
We have just run the website a few hours ago and haven't had any advertising campaigns at the moment besides this post. We will run advertising campaigns soon in the future and you will see more players.
We will transfer 11 bitcoin into this address (39CF9XzpiBHDjnRyadGJgebauNeCMUdaoi) to make proof. After that, we will withdraw it immediately because we won't keep bitcoins in hot wallet. We keep them in cold wallet.
Lots of leaks

First, this site is cheap looking and i dont believe that someone do have that big money wont focus on sites design.
Second, i checked out on the address you have given on where you pass up 11 BTC on 39CF9XzpiBHDjnRyadGJgebauNeCMUdaoi which cames from 1NDyJtNTjmwk5xPNhjgAMu4HDHigtobu1s (which is a binance wallet).
This isnt a cold wallet and with that amounts of bitcoin alone.I dont see you do need to build a cheap looking gambling site.

Dang! I will wait or watch this thread on how OP respond to this one.