I won ~15k for 3 hours, every withdraw was fine.
But now they locked my 600MBTC for no reason.
The Live Chat told me there is a problem with the system.
A friend withdraw his money and it comes instant to his wallet.
Smells a bit like a scam of 600MBTC.

I'm sorry to hear that you had an issue with your withdrawal! Could you please provide me your username and I could have a look, thanks!