Here is my prediction, if he managed to withdraw again from the 2nd account, for sure he will not return it to the casino and hey may try it again by creating 3rd account.
Check his 1st and 2nd accounts activity. He gambled in the first account and when withdrew from the first account, he forgot about that account and started to be active from the second account.
We hope there is not a next time but, next time we are going to share evidence only with a trusted forum member so we don't blow up how we can detect multiple accounts
Now that there is no 200% bonus, would they come back lol? Well, there are many other reason for which people create alt account. One of them is by passing the limit of bet. Since you have special treatment for high roller, I think the chance of multi account is too low now.
do you offer esports especially csgo?
Esports are coming soon as I can see in the OP here.