Deposit 10 bitcoin and then do 'all in' at 49% win of chance, means you already wager 100% of your initial balance. In such case, I am sure they will let you withdraw your money unless they detected one or more suspicious actions committed by you. Such good and well-known site will not ruin their reputation tho!
Do they even said if we must wager 100% from our deposit before we can cash out our money? Where is the rule? Is it on their ToS? I see none.