This is the second year in a row that I'm receiving money in my 1xBet balance as a birthday present. Last year it was around 10$, I managed to turn it to 60$ and lost it all at once. This year I got around 20$, tripled it, and withdrew lol. The funny part is I did not make any deposit since November last year. Kinda nice of them, don't you think? Does a bookmaker you play on do something sort of this apart from free slot spins that you can redeem your winnings (play x game and double your winning in case you win or play z game and get back 50% of your bet in case you lose) only by playing your own money later?
I don't know if any crypto casino offers birthday bonuses because I am part of many and I can't remember any of them offering any kind of bonuses. One reason might be because everyone wants to be anonymous in these crypto casinos and hence casinos would never know if it is actually your birthday or it's a fake date. I mean one can make an account and set their birthday date for the next day and get free gifts. So unless crypto casinos start KYC strongly, I don't think they can offer much.
That said, I do get a small bonus every year from stake at the date I joined there. I get a cake next to my name in the chat and I can ask my VIP manager for a bonus and they arrange it on that day. Obviously, it's not my b'day but it is rather the day I joined the site.