In that case it would be very helpful if the administration provided an accurate definition of what spam actually is, but that is rather a topic for the Meta board.
In my opinion, posting ellipsis in order to fill up the posting requirement of the campaign qualifies as spam, as I caught them doing.
Agreed. They did sticky some threads related to spam, but they didn't clear up the confusion completely which is understandable since it's a highly subjective topic.
Honestly, spammers are present in literally every single signature campaign, but they are obviously present in larger numbers in campaigns related to shady sites like 1xbit, Yobit, Adkinsbet etc.