If anyone is a good gambler and is not involved in anything shady, duelbits or any good casino will never block their account if their IP is changed often by logging in from mobile, computer or through VPN. Sometimes if your VPN location is that of the prohibited location, they may ask for the KYC. If you have no bad intentions, it is assured that your account and funds will be save at the site.
Yes, if there's no intention of cheating or exploiting and you're still following the rules. There's no need to be worried of, most casinos are too strict when it comes to this matter.
But if they don't see anything wrong or any suspicious activities under your account, there's nothing to worry about and if they ask you some questions regarding that, you just have to answer what you're up to.
If you frequently use vpn, you should be ready to submit your KYC if asked by the site. Some people do not want to submit KYC and when inquired about the kyc, they refuse to tell anything which may result in account suspension.
Duelbits has a lot of promotion if you will go to there promotion page. This 5$ is exclusive for long time offline player to attract them to go back playing in the casino. Actual other casino offer this kind of promotion but in different way like free bet and free spin which I saw on fortunejack and sportsbet promotion email. You can check out too the Ace loyalty rewards because they are giving instant bonus base on the amount that you wager in the casino
I have also seen casinos having this strategy to retain their inactive customers as when you give them free opportunity to play once the interest come back and then you also wager some amount from yourself.This $5 free bonus to the players is also good approach from the duelbits team.
Not only this, but also you can use a promo mentioned here (
https://twitter.com/Duelbits/status/1504228933595713538) to claim free 1$. This is a granted gift for everyone who uses this promo code.