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Not that there is anything wrong with VPNs in general. We respect the privacy of our users.
The problem with VPN makes it that, multi-accounting becomes a little more complex to deal with.
A dedicated VPN with a static IP address, not a bad idea
Sometimes, even legit users can become suspicious when using VPN because previously it could be already used to register on your website that is why as you said dedicated/static address can solve the privacy issue. but occasional gamblers think it is an unwanted subscription since they enjoy the same features for free but forget about the servers they are going to get connected.