User blog comment:Javelin1/Hide the spoilers on this site./@comment-68.117.163.2-20130820130351

The problem with putting a spoiler warning only on the main page is that most search engines dont redirect to the main page. If you search "Attack on Titan wall sizes" it redirects to the page about the walls. Anyone looking up a specific bit of information will not be redirected to the main page, rendering that warning useless.