OP,
How sure you are that they already forgot about those casinos? I think it is not possible to ask them all. Maybe it is only in your head because they are rarely being talked about but it does not mean that their previous players are not supporting them anymore. Like me for example, I still access the casinos that doesn't have a signature campaign in the forum. Some stop their campaign because they might have achieved their desired results already or they are having a problem with their finances but some are still going back again after some time, when the issue have been resolved already.
We only think those casinos that have a long-term campaign are still popular, it is because we always see them and then they are also being talked about often. Obviously a casino can get a significant benefit from having a signature campaign and that benefit would be, is a massive traffic, since our forum is the biggest in the crypto world. The longer is also the better because people will get familiarized with them and then new users in our forum can still see them.
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
Is it because they will just click on the sigs? But we can as well bookmark them. About the issue, it is not the campaign that is needed but it is an active ann thread. We can also contact their customer support inside the casino.