Spam is a type of vandilism that includes uploading copyright violations, such as an image from another franchise or someone else's fanart other than your own without permission can get you blocked for a while or permantly banned for doing so multiple times.
Admins, Wikia Staff, VSTF and Helpers are at the wiki to make sure that there is no spammed images (copyright violations) or links to other sites that aren't allowed aren't on wiki.