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.
That email is not from a gambling site, it is from a scammer. I have registered on many crypto gambling sites that have announcement thread on this forum but non of them are disturbing me with email messages. Most of them did not even send email message at all.