Do bitcoin casinos require a promo code?

I'm curious about the process of accessing promotions at Bitcoin casinos. Is it standard practice for these platforms to require a promo code in order to take advantage of any bonuses or promotions they offer? If so, how does one typically acquire these codes? Additionally, are there any other requirements or steps that need to be taken in order to redeem these promotions? I'd appreciate any insights you might have on this matter.