With hundreds of thousands of dollars spent on your tools to detect abusive multi-accounting, your platform should have automatically blocked him from depositing more and playing. Also please use regular text formatting. It's hard to read with the blue wall of avatar like texts.
It kind of sounds like you are blaming the victim here. How about people just not create abusive multiple accounts and this won't be an issue?
It is impossible to please everyone here. If we give him the information about how he was caught, then he will be able to create new accounts without being caught. If we insist on high level KYC upon signup, then people will not play here because other Bitcoin sites do not require this. Many, many multiple accounts are found and closed, prior to them depositing. But there will always be ways to create new accounts. These abusive players make enough money to where they can pay someone else to do KYC. We have seen it happen countless times, which is why you hear about Skype calls, taking pictures near local landmarks and other seemingly invasive verification methods. There is no way to make everyone happy. When an abusive account is found on the withdrawal review, people ask why wasn't it found until he requested a withdrawal. In this case, we found him before he tried withdrawing and now people ask why wasn't he found on signup. The reason is that these people are professional cheaters and it can take many hours of research to confirm what is happening. This is bad for the industry, because it takes that time and money away from making better products for the vast majority of legitimate players. Therefore, blanket statements like "That's the way the industry is" or " The market is still thriving" do not have to apply here. We are doing what we can to make the industry better. We are doing it fairly. If players continue to create multiple abusive accounts, that is not on us, and they knew what they were risking when they attempted to cheat. If everyone just got their deposits back, they would be risking nothing. If abusive players know that they will no longer get their deposits back, they will be forced to find other work. In every society, thieves receive penalties for their crimes. We are not to blame, if a thief decides to steal a second time. Play fairly and you will get your winnings quickly. It is that simple.