The one that needs an option is only for newsletter subscriptions.
I know it can't, but as you saw, some users here claimed that their email inbox will go "full" if such notifications are to arrive at their emails. I think everyone has their own choice and so the casino gives such things as options. It's definitely a mandatory thing to be known by a gambler but as I said, people who don't even visit their emails too often will definitely miss out on such opportunities.
This is why i do agree that nowadays where this kind of feature is already giving out the option neither you would choose for email ones or you can simply set out
into those typical internal notifications and its true that this is can be seen nowadays on most gambling sites where you do really have that kind of option.
When it comes to player awareness then we do have our own preference.
Yes, it is better for the casino to give options to its players, whether to receive via email or just internal notifs. Now, if the player missed it, then, it is not the fault of the casino anymore. Because if you are not a regular player, receiving in your email will just be a clutter in your mailbox.