I don't even know how the forum survived 10 years without AI...

In this regard, it is up to campaign managers to ensure that they only accept users who are clearly participating in the forum, without resorting to generating AI-generated data in a generalized way.
Users in the forum and participants in campaigns only or a little bit more softly to say, mostly use AI when they have no time for posting. It's clear and very noticeable that they use AI to maximize total posts they can make, you know not only from that account.
It's quite interesting to see AI users for posting have very good merit stats that in theory should be good and quality posters as it's weird if they could earn a lot of merit while they are not good posters. Only three noticeable things: good merit history, shitposting history, and AI use, are very enough to conclude about these accounts as well as their reasons of using AI for posting.
Forum will exist without AI users for posting but they will not stop doing that because they can rank up easily - I am not sure will they get more troubles of ranking after latest policy change on AI from theymos, but I'm doubtful that it can prevent them ranking up speedily and easily.