But support won't answer such things like they are legit or not because they are responsive to any issues on the site but he/she don't need to worry about duelbits.
Support is obligated to answer all casino related questions especially to prove their reputation to the customers that having doubts. They can provide their legal documents such as license to prove how legit they are including their years of service.
Conversation on ANN thread is really helpful too to get information without any bias since members here are giving their personal opinion without an incentive from Duelbits except those Duelbits signature campaign participants.
if you open a request using the main website you'll have no problem, they'll answer even if it takes a while
as Wapfika mentioned here is not the best place for support questions even though sometimes they do answer too
about the signature campaign has lots of posts and conversations going on here
https://bitcointalk.org/index.php?topic=5280190.1360