The link doesn't work for me. The site doesn't load at all.

As for their responsibility to act and stop addicts from being able to use the site per their own request, I agree that they should comply.
Looking for addicts and actively trying to determine who is who, if they use vpn or have new accounts and such looks like bullshit to me. Nobody is going to dedicate time and resources to that. If addicts wants to be smart with the casino and keep playing, they will find a way and no court will be able to prove that the casino knew who is who. If you put effort into hiding your identity, you are at fault here, not the service provider. It's like with online stores that ask you if you're 18. If you lie, it's on you.