I doubt, especially with known platforms already. Reality is that only a small number of bettors are in this forum to start with. Signature campaigns are meant to build up the platform's popularity and engagement to its target communities. So once things are already up, it won't be that much of a downside since everything's established. Another proof is gambling platforms that has no signature and weekly campaign, but still operates and being more known by players inside and outside this industry.
Just an observation, but I’ve noticed that many casinos with signature campaigns eventually stop, and the community seems to forget about them. Meanwhile, the casinos with long-term campaigns are still popular today. Of course, we can’t deny the popularity of these casinos...Stake, Sportsbet, Rollbit, Duelbits, and Betcoin.ag. Maybe it’s because they run their campaigns long-term, so their presence is seen daily on the forum. So, do you think casinos get significant benefits from having a signature campaign, especially when it’s long-term?
To me what I sense is that when they are active here it makes it that easy for people especially gambler to use them, and can easily sort out issue when there is any need for it. Though there presence really matter because you can trust them immediately they shut their campaign, in fact it's like an open way to attract more gamblers.
At least in this forum however, not all people in this platform are gamblers as I said above. There's a bigger percentage of a platform's players from outside this industry. Some gambling sites are now even using mainstream advertisements such as being involved with leagues for example is boxing matches. But I agree that the presence of these campaigns matter especially if the project has the capacity to extend its longevity and to not shut it just because they have already achieved popularity.