I would assume that due to how members of the forum perceive 1xBit participants it could be possible that their spam posts would be more noticeable around the various boards and would lead them to be reported more often and have their posts more frequently deleted.
Many of my posts and those of others from the 1xbit campaign have been erroneously removed for no reason at all. The real reason is that all posts from almost all people participating in the 1xbit signature campaign are deleted, while the content of the posts is fine.
Those deleted posts were not fine in quality and must have been deleted for good reason. If more posts from a certain campaign were deleted more often, that will be a sign that the participants are shitposting alot.