Why do I feel it is a deliberate action done by the casino. I think this is a form of promotion to earn the trust of users. Casino's can go any length to advertise themselves even if it is to lose money. Basically, reputable casino's spend so much money in endorsement and advertisement. But 30 000 000 euros is quite a huge amount to pay users for free.
The amount of money that was involved should be enough reason to prove to you that it wasn't a form of promotion and it wasn't a deliberate act by the casino, there are other better ways to do promotions of the company is trying to get more customers they can even decide to double the despite of customers just to intise them to rush to the casino but the amount involved in this particular case is too much but the casino has to pay up to attract more customers and to gain more trust and popularity from others who must have gotten the information as it was spreading across all over the media.