public function getCommercialUseNotAllowedWikis()
 {
     if (empty(self::$wikiList)) {
         self::$wikiList = WikiaDataAccess::cache(wfSharedMemcKey(self::CACHE_KEY_COMMERCIAL_NOT_ALLOWED), self::CACHE_VALID_TIME, function () {
             return $this->getWikisWithVar();
         });
     }
     return self::$wikiList;
 }