It is a pity that gamblers and the casino has to wash their dirty laundry out in the open on forums like this. I have had my fair share of gripes with casinos, but I have always managed to sort it out with their support team, without having to go into a flame war like this.
It is nice to see that rating companies are following up on grievances like this, because we need a good watchdog to go up against dishonorable casinos.
Looking at the evidence provided by SportOdyssey, it looks like there were genuine concern over the legitimacy of the betting being done, but in many instances casinos will look for technicalities to get out of paying out people's large wins.
The lesson to learn from this is to stick to the ToS and not to take chances, because the smallest technicality
might void the payout of a large win in the future.

Hello Kakmakr,
Thank you for sharing your thoughts.
As you ALL can read in the link of our conversations.
We didn't steal any deposit like what fraudsters are claiming here.
All deposit has been refunded to their respective Bitcoin Address.
We have our rules in place and they violated it so we have the right to forfeit their winnings.
Thank you.
Yes, but every case has merit. Your casino has detailed information on every gambler on your site. If this user only made a minor infringement, then the recourse of your actions are a bit harsh.

You could have determined what the impact of the other duplicate account could have been, based on the bets that he or she made and then based your decision on that.
Let's say the other account made only 10 000 Satoshi, then that would obviously not have influenced anything....the person probably just created a second account out of personal preference or just to experiment with new games etc. < I created a fake account at a gambling sites once, just to see if they were a scam site or not and then after I established that it was not, I created my actual account. >
Every case has it's own merit and you have the data to make that determination and the decision. Your actions does not come without consequences, because many of these instances lead to flame wars like this and other potential gamblers might steer clear of sites with too strict rules and regulations that are enforced or if there are too many complaints or incidents like this. ( I always Google "sitename" + scam ) to see if there are any scam accusations against a site and if I get tons of hits like this, I steer clear of that site. )