Yes I also think this casino is one of the best vpn users friendly Although I don't know when or how long it will last . And yes most of the case when some players use free vpn which are not provide the best service then they face some errors. Even then it's quite vpn friendly but it can't speed up internet speed so I also think it will be a good step if build miror link taken .
They don't allow use of VPN if you are playing from a restricted region so we can't say they are VPN friendly casino and you can read it in their T&C in which they clearly mentions about it
https://duelbits.com/tosSo you are using it on the risk and once they find about it you know the consequences of being banned.
Unfortunately people do this all the time, even I did it once upon a time and hope would never have to do it again. When they are banned to play from a region they end up using VPN because that is the easiest option. Plus many arabic nations have rich people who love to gamble and they are banned and even ISP doesn't allow the webpage to be opened, fully anned, so they go full VPN route and that is the problem with this and I doubt it would change.
Whatever you do, always follow the ToS of a casino because the worst case would be all of your money locked out and you would not be withdrawing it and your account would be frozen and you will have nothing to do but to hope for the best eventually.