When we've risked and won big out of the same, we have the rights to withdraw the amount and use it. Already several users have made big win out of these casinos and withdrawn it.
I'm sure there are already big winners on Duelbits much bigger than what OP's projected money to withdraw and they have withdrawn it, and there are no complaints that one of its players cannot withdraw his huge earnings, so it's not right to cast suspicious on the reputation and capability of Duelbits, the majority of us here consider Duelbits as one of the top casinos in the industry and they will live up to their name, so why not try them, deposit, play and try to win that huge amount of money.
Based on what I understand on OP statement. He is just asking about the possible scenario in case he increase his bet size to the point that he stated on the title. I don’t see anything wrong with it or any negative comments about Duelbits reputation besides an honest question for the sake of his money on the casino. We already knew how trusted Duelbits as forum user but it’s really scary to bet huge amount of money if you are just new here.
So instead of giving this kind of retaliation then why not just give an honest feedback about the casino if you have anything to contribute here.
@OP, You can simply go to the high roller board and check all bets there. There are also some users that betting 6 digit figure and successfully winning 7 digit figure without any problem. I believe your account already KYC verified since you are betting worth 1000$ each bet.