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.
The promotion is surely a good one and it helped the casino seal it's integrity and love for it even in the hearts of those who were only interested in exploiting it. The story would fly around of the generous casino who have enough funds to pay whatever is won. It's a good marketing strategy and one that would definitely convert for them sooner than they expected because all the clients that exploited and were payed without troubles with definitely be back with their friends to patronize the casino once more.