They accept VPN and even allow users to change usernames but prevention is better than cure and if you can use their service without VPN, why do you need VPN and use it if you are aware that VPN can cause some kind of troubles in future?
That means users can safely use a VPN and there won't be any problems. But that will be up to each user because some users still want to use a VPN while others will not use a VPN to access their sites. It is about someone's comfort in visiting casino sites with or without a VPN.
As long as using a VPN is not a problem for Duelbits, I don't think it's a problem either, but you really have to ask their service support if you can use a VPN and provide reasonable reasons why you use a VPN. Indeed, some people always want to appear anonymous, so they don't want to reveal their original IP. whereas in my opinion it looks like a child, but as long as it makes him comfortable there is no problem with me.
It's also important to confirm that Duelbits doesn't ban VPN use if that's not a problem I think using a paid VPN is the solution because it guarantees more security than using a free VPN because I've used it and it sucks having to share with other people and it's hard to access the site in the end That.
Let us not speculate, instead read the TOS to ensure we know what we are doing, as the TOS stated.
I just quote part of the TOS;
By accessing or using duelbits.com or you confirm to be not from any banned or restricted Region. You may not access the Service from a banned Region via a VPN.
You can read the full details here
https://duelbits.com/tosThat's the only reason you would get banned from using a VPN. If you use a VPN to access the internet for the purpose of protecting your privacy, there should be no problem with that.