The positive is that the spam is restricted to that section.
True, but I don't think they should be allowed to exploit campaigns and the forum in such a way. It's not permitted to multi-post so neither should be regurgitating something you said on your several alt accounts all in a row.
Has any warning gone out to campaign operators like FortuneJack?
Not from staff as far as I'm aware. I'll contact them about it shortly.