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VPN is make a confusion.
So, I not recommended to break any restrictions with VPN because can be used for broken their T&C. About currency, rather than reading the term & conditions just try to register and see inside of the casino.
Even casino can approved some VPN for only avoid restricted provider, but I still not dare to use it in case win a lot and some bad situation is happened and they used for that reason for my account.
Agreed, VPN is not recommended to bypass the country restriction by the casino but it is fine/safe enough to bypass the restriction by providers. I was actively playing in duelbits since the first day and I always use VPN when I want to play slot from some specific providers because I cant play it without VPN. At least I have never experienced any effect of using VPN so far although I have never made a huge win (max few thousands $ only).