They can accept VPN as long not for abusing platform, that's mean to avoided some restricted country example like in the slot from the provider it self. You can use VPN, but can't use them to break any kind activity against the platform like (Restricted country from casino, abused promotion, self referral, etc).
but that brings a question
how would they know if you are using a VPN to bypass a restriction from determined country or not?
since your true location would be masked.
It is very easy to distinguish specially if your IP address comes from different continent, in which you are using both of them in just short period of time. I'm not sure if that is right, but I think there are programs also that can detect if your IP is masked or not.
I think there is a program or software that might be able to detect if someone is using a real IP or a VPN and only people who understand the problem will know.
We can use a different IP from the VPN, but they will check our account further once we break their rules.
As long as it's used properly, I don't think it will bring us any trouble so we'd better make the best of it.