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.