Just checked their leaderboard and found that one people managed to get over 10k credit profit, another one at 8k profit. Most of the leaderboard consist of player that lost all their 1000 credit. Perhaps alot of people tried to abuse this
https://dicedice.me/leaderboard
Well, if they have a good detector to see cheats like doing multiple accounts that will not be an issue and as long as they wouldn't allow to send credit over other accounts especially if those are just only free credit that's nice of them. https://dicedice.me/leaderboard
Did you read all the replies on the first page of this topic? 
They are giving 0.00105229 BTC / 1000 credits at this time but the user needs to make it ~0.01 BTC to make a withdraw. And it is really very hard to reach 10X by playing dice and baccarat. ( I am not sure if anybody will make 0.009 BTC deposit to withdraw 0.010 BTC will be eligible to withdraw or not)
I don't think that will be agreed, that wouldn't be profitable on their side. Free credits are only meant to be played not to be withdrawn, even if they make a deposit of 0.009 or something to make the minimum withdrawal. It's still a business. They are giving 0.00105229 BTC / 1000 credits at this time but the user needs to make it ~0.01 BTC to make a withdraw. And it is really very hard to reach 10X by playing dice and baccarat. ( I am not sure if anybody will make 0.009 BTC deposit to withdraw 0.010 BTC will be eligible to withdraw or not)