I wonder what's the problem with your account not receiving this kind of notification. I also have this notification sent to my email and I think our account is almost at the same week of creation since I only create my casino account when I was applying for the Casino's sig campaign.
The main reason is regional restrictions, some users come from countries that do not have a license to play in several games and this is not new, this often happens even when claiming the campaign bonus as I experienced a few months ago I have to ask the admin to credit my free spins bonus to another game. Another reason is because users often use VPN so IP is different in each login sometimes this is considered spam and excluded from promotion.