Yes, some flag their work extreme, to get more reads, but us mods have to go through and check off on all the extreme content entries. Sometimes we remove the warning if it looks like it was flagged to get reads and didn't really contain anything that was truly questionable.
Basically if it has blood, sex, gore, profanity or anything that you wouldn't want young children reading, then it needs the flag. Sometimes too, with very touchy or controversial topics, the warning could also be used as a "please know that this is a serious topic, read with that in mind , be respectful of it, etc,etc" and not because it contains the stuff of porn and slasher films .
Thank you for this clarification, that’s actually extremely helpful.