Unsubscribe button doesn't work on your emails.
Do you want to unsubscribe from them? Is it that they disturbing you with un-necessary emails? Yes there are some emails that you will receive that you can can't unsubscribe from them so what you have to do is to ignore the messages and delete them. On their own they will minimize the emails.
It is not that important thing to know whether the emails are disturbing or not for him but the the report that the feature is not working is the main point here IMO.
With the report, the casino can fix it as soon as possible so there will be no complaint from their players who want to unsubscribe their emails (mostly promotional emails) that can be something annoying for some players.