Its business but they should have at least followed on what the user had requested on when it comes to those kind of blocking or self exclusion because this is really part of their responsibility
but pretty much sure they had done it but this is actually on users fault in most case since he does know that he requested out something like that which he should presume that he wont
User asked to close his account because he is addicted. The casino continued to send him information about promotions. How could this be the user's fault?
If I make such a request and get a confirmation, why do I need to do additional tasks?
I somehow agree with you in this statement. When a person voluntarily quits the gambling scene, he does not only strip down his account but he also decides to leave it for good. Any kind of temptation that would lure the person into gambling again could be fatal, especially in the first few days/weeks of the person quitting. Just like in any other kind of addiction, the withdrawal of a person may start and this could lead to issues that would somehow force the person to go back into his addiction.
Once a person decides to leave the gambling scene, he also has the shared responsibility of informing people about it to avoid any potential issues. Like what OP had mentioned, he has the responsibility of telling stake that he does not want to receive any further email/promotions to his account.