Why are posts with spoilers in the title allowed?

Like yesterday there was literally a post titled something like “I knew it, The king of Incheol was on Busan’s side” way before the translated chapter got posted. Like c’mon guys if you’re gonna mark a post as spoiler avoid making the title contain the whole spoiler. This is just an example but it always happens when Raws get posted and it’s just kinda sad that you can’t navigate this subreddit during those times because people can’t use the spoiler tag the way it’s supposed to.