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.

Well, it it was for promotion it worked, everyone over there will trust the casino no matter the circumstances.