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It's how a signature campaign works, through its signature exposure to forum members in posts. When participants in a signature campaign make their posts, their avatars and signature spaces will show Wolf.bet brand to most of forum members. Why I said most of forum members?
It's because if forum members turn off displays of avatar and signature, they will not see Wolf.bet brand. Anyway only the minority of the forum turn avatar and signature displays off, so signature campaigns can work well for companies.
Additionally, if a campaign has many participants with many weekly posts from each participants, it can gain considerable effects from their campaign.
You're right, signature exposure will only be visible to those who haven't changed the display options. Some users may not want to see signature and avatars for personal reasons, but not many disable them. So far, signature campaign can help brand awareness promoted on forum, not just for casinos, but for all brands that host campaign. Customer interest depends on how good the casino is, sometimes not on who promotes it.
Ideally, the larger the promotional budget and the more participants promoting the brand, the more likely it is to generate interest. Some brands only run campaigns for a few weeks due to limited budgets, but I believe this is crucial for brand awareness. The more participants and the longer it lasts the better for the casino, the casino will naturally become more famous.