blackjack.fun will get more attention because games and rounds one of the most active threads.
This statement can be correct and also false.
Because the attention is also depends on the type campaign it self & how the rules of the campaign. As you know, we can take example a contest promotion like Duelbits some of the scenario only have under 10 entry.
Free stuff is always get the attention comparing need some money to join the campaign.
I remember last year, Roobet created several promotions under the services thread where they let users participate in creating posters, paintings, GIFs, etc. in exchange for a valuable consideration as the prize. Lots of forum users participated in such promotion and there are also users who won a hefty amount of sum in the end. I do believe that this kind of strategy works best in terms of promoting a gambling website.
Lots of traffic in this forum also generates promotions to all the signatures being posted across the forum. As blackjack.fun is currently active in games and rounds, the potential of attracting more users to its website is definitely high. I just hope that they create promotions (just like what Roobet did) in order to further boost their reputation as one of the solid gambling websites out there.