Where do you read this? Duelbits allowed the use of VPN but not playing from restricted country. There’s many usecase of VPN and one of them is for privacy for purposes that’s why many user use it even if they don’t live on restricted country to access the casino. This is the case which Duelbits allowed the use of VPN.
But for those whose using VPN to bypass country restrictions will surely be penalized when caught by Duelbits team since this rules is clearly stated on the ToS. Allowing such players will put Duelbits license in jeopardy because they have legal obligations to restrict thise players.
As long as I know and as my own experience, VPN is allowed to bypass ISP block only or to bypass the block by 3rd party providers but I dont think it is allowed to bypass countries restriction as per terms. In the past I used to use VPN anytime I played in duelbits in order to be able to play some providers such as relax gaming and no limit city. Those who are coming from the restricted countries should not try to bypass the restriction by using VPN unless they are ready for any possible effects.