Benjamin Newsom is a user on octodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
If you don't, you can sign up here.
There you go, a explicit list of topics requiring a CW in public timelines. https://octodon.social/about/more
Simple: put a CW on NSFW or violence in any way or you get silenced/banned.
Use more of them in an opportunistic way, for anything negative or depressing.
@CobaltVelvet I actually hadn't considered the possibility of using a CW with respect to spoilers. That's actually pretty handy for people that want to have a public discussion but not ruin things for people.
@Rasgueado Yeah it's even a great tool for jokes