It is a good promotion, I guess this can only be applied to those who did KYC for verification or else they will not know when to give their birthday present. Each platform has their unique way on giving away prizes or gifts to their users. I guess the more you use their platform the more previlege you will have.
Indeed. Maybe only a few people will verify themselves for playing gambling. But I doubt that many gamblers will do that since they do not care about giving their actual birthday because that will be related to their identity.
If you often use their platform and you are hard to take a break for a while, please be careful because it could mean you slowly become an addicted gambler.