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.