That's been my personal experience. Has anyone had a different experience, particularly with online crypto casinos?
The entire concept behind cryptocurrency has to do with anonymity and I do not think that any crypto casino that really understand what cryptocurrency is will like to adopt the habit of regularly sending emails to customers as that can become a disturbance.
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I dont think it is the right of the casino to send you notifications without your permission. Most casinos send a prompt on the screen asking you if you would love to receive notifications in your email. Sending emails without customers' permission is wrong, so casinos should understand this and learn from it. I'll drop a review in the casino app i am using so that if they are doing it the wrong way they should take note.
Meanwhile one can restrict messages from a particular sender not to receive email again from them through their email. So it's not gonna be a disturbance anymore once they restrict or mute the casino from sending them emails.