sadly betfury closed the signature campaign on this forum but if only they knew that there is a lot to be gained by campaigning for casino on this forum in the long term i'm sure betfruy has the funds and also a great marketing team i think the betfury marketing team can think about campaign on this forum in the future because many casino examples you mentioned above have also succeeded from this forum.
They seem to be satisfied with the result and it did helped them to gather more users and investors into their platform.
Running a long term campaign is desirable and will give the benefits that the other casinos that has ran a campaign for a long time and then saw the impact for their casinos.
With or without budget issues, they know what's best for them and they've ran campaigns several times so, it is for them to decide to have one again in the future and still stick to the plan of having it short term.
One thing with campaign (and by campaign, I assume forum signature) is that its best when it's done long term, yes, it cost money and all that, but then, it wins more customers for the casino if it's the campaign is allowed to run for the long term, check out all the casinos that have their campaign running since God knows when, they are all doing fine..
But then again, I still agree with your that every casino have their marketing term and it's up to them to research and know what marketing strategies fits their business, maybe based on marketing budget/allocation available to the marketing team.