Provably they have done enough with those things and now they want real gamblers who usually play at their casino to enjoy the promotion they offer that's why its better they change something then apply some sort of requirements to validate their real players. And this is really good since they can cut their spendings by cutting off those abuser who just came on their casino just to abuse those free stuffs they offer before.
They know everything about it and also for sure they see the real statistics that's why they are fully aware about existence of abusive activities on any reputable casinos. Its undeniable that duelbits is one of the best casino so expect that they are more smarter than those people trying to take advantage on their promotions and other things they offer to their community.
The current Christmas Promotion is focused on the main giveaway for the rewards while the challenges only rewards small amount since most of them is on free spin reward type. Duelbits has 2 types of grand draw which both rewards huge percentage to the total reward amount.
Duelbits current even is focus on pushing whales to play more in exchange for having their win rate increase since they need to accumulate more tickets just secure position in the grand draw.