Well, signature campaign not the only ways from Wolfbet to run a promotion
You are right mate, the signature campaign is not their only way to promote the brand but if you open the site then you will also know that wolf.bet also has an affiliate program that can actually be used as a promotion on various websites.
Meanwhile, I see no indication that the wolf.bet campaign requires a lot of participants from various ranks. It is possible that the manager and site owner are satisfied with the performance of the actual participants who are the best participants chosen from a strict selection. At the moment the campaign has 30 participants from two rank (Hero and Legendary) with an average number of weekly posts over the past 3 weeks is 771.6 posts spread throughout the forum as I can see in the campaign spreadsheet.
Wolf bet do want to maintain their branding by having good quality poster here in this forum and not by getting participants and let them spam all over the forum, I've been a member of wolf bet signature campaign and I have good experience with it, They do pause the campaign for weeks and coming back with finding new members of the campaign and I think it is a good move for wolf bet because they are staying as a signature campaign for a long time but they pause and resume the campaign. As we see today they are a well-established gambling site all over the crypto space and the promotion they did is an obvious success.