Board Thread:Support Requests - Community Management/@comment-33460885-20181120205505/@comment-1038387-20181120210827

It's not a spam category, it's a maintenance category created by the MediaWiki software. That means somewhere on the page, there's a redlinked image. If you get rid of that, the category is removed.

As it's a maintenance category, it's useful to have it, at least, to keep track of things to clean up. You can use __HIDDENCAT__ on the category page to make sure it isn't visible when people view the page.