To make a statement on the current debate, I think a list of mandatory CW would be a good start on the instance level.
You can't enforce a rule if there's no explicit rule; you can't expect someone to CW everything you think deserve one without making it explicit.
So what would you want on that list?
@CobaltVelvet Porn, real-life gore (think pictures of a terrorist attack or a warzone), videogames or TV series spoilers
@PW @Weeliam Sorry I should have phrased that as "videogames spoilers or TV shows spoilers", but this still misses movies spoilers and books spoilers so yeah let's simply say "spoilers".