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.
Duelbits still allows VPN use and as long as your country is not from a country blocked by Duelbits, it seems safe. But using a paid VPN is better because you don't fight over IP with other users. And people who still use a VPN may feel safer when they can use a VPN to browse the internet where we know that there are lots of crimes that can cause us to lose a lot of things including data.
But we also have to be prepared if Duelbits asks us to do KYC one day. Maybe they just want to make sure that we are only gambling and not related to any illegal activity.