And there is the catch. They are supposed to promote the VPN but in reality, they are setting a net (of protection or trap, take your pick) from which you cannot escape and you will always depend on their judgment and appetite. They profit from the advertising and the hype that is caused, they force you to go through the KYK for withdrawal (at some point they all do it) and if they consider you shady, they simply change the ToS. It's better not to use a VPN, you get into trouble from the start.
However, other casinos might probably promote using VPN, but later on when problems arise, that’s when they have all the right to change and update their ToS.