Hi,
Quick explanation. We had a bug report today (first time in 3 years) on crash game. It will be fixed within few hours.
Bitcoins from your bankroll can't be stolen because we use hot & cold wallet + all withdrawals have to be approved. The user which had a 10BTC win started with 0.00001BTC and was intentinaly exploiting the site and of course that client is not obligated to payout that.