This is a huge problem with small community fandoms: a small creator will make art/music/fanfic, then years later it will get deleted for unknown reasons.  Maybe the author isn't proud of it anymore, or the account got hacked, or they got DMCA'd.  Then it's gone.  Maybe someone with a copy will reupload it, if they notice.  But more likely, especially with small fandoms, it's gone forever.