I reckon they have been losing money for quite a while (which they can afford to since before last year they have had very profitable years) and were hoping the promotions and tournaments would pick up activity for the site (which didn't happen), but now they are ready to call it quits and cut back on costs.
The promotional team of Duelbits is responsible for all these things. Believe it or not, most of the promotions of Duelbits have given sure profit to the users. The terms of their promotions were too easy. Where most other casino looks into the probability of revenue before running a promotion. Perhaps, Duelbits team have observed all these things too lately, which has affected their revenue badly.
This legit especially their big event such as Easter, Halloween, Christmas event that usually rewards users with cash drop without wagering requirements and other rewards such as free bet and free spin.
Although the recent years they gradually change their mechanics to challenge type that requires more wagering to claim the prize which gives a hint that they already starting to become less generous on their promotion.
I think they are cutting cost now on their marketing because they already have good amount of active players that loyally playing.