This is my first time seeing that Stake do give bonus to their users which I have never seen anything like such in my account. Maybe the bonus is only limited to VIP users which I am quite skeptical about it. What I know is normal bonus like weekly and monthly bonus that is given to users based on their activities on the casino.

I know Stake is one of the generous casino that I know and I hope to get somehow this kind of bonus on my birthday. Maybe I am not always aware about such birthday bonus in the past.
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This bonus has been available for a long time but only for verified users if your account not verified they don't know when you were born, just kidding
The thing you have to understand about this bonus is that the amount may be different for each VIP level and your account status must be active/playing to get the max bonus, if without activity the bonus will definitely be lower than normal. Last month I claimed $25 for Platinum 1 and they said for Plat2 about $30 while for lowest level Bronze $5.