Even though there are casinos that are friendly to VPNs, and someone uses VPN to play at the casino, they are actually still vulnerable where the casino will have a problem with it later.
I've never come across a casino that accepts the use of a VPN. Even those who claim to be friendly simply fail to mention it in their TOS as a mechanism to attract maximum traffic. However, the use of any type of anonymity quickly becomes a violation of the terms of service without the need to explicitly state this in the TOS.
Logically, no casino would accept this, as it encourages multiple accounts and system manipulation, and it also doesn't meet the requirements for obtaining a license from any authority.
I get what you're trying to point out about this dude, and it's true that most casinos prohibit the use of VPNs because they want to avoid having problems in these situations. But what if, for example, the country in the casino is restricted and there are other gamblers who want to use VPNs because this is the only way for them to play, is there a chance that the casino management will allow them even though the region country is restricted on their platform?
And if they ever allow it, it seems like the ones who will end up losing or being cheated are the players or gamblers who use VPNs because the casino management can say that VPNs are prohibited for them especially if they know that the gambler will spend a large amount of money from his winnings.