Having been here since 2016, I can tell you there is definitely no such thing as a consensus on usage of content warnings on the fediverse. It's a decentralized network that doesn't belong to any one party, so by definition there is no single culture on it. Different corners have different expectations and customs.
@Gargron I think it's a great discussion (though I seem to get blocked by someone every time I wade into it). I'm still very interested to see a section on that in an open source "constitution" of sorts for the fediverse. Servers could adopt the constitution in whole or in part.
@Gargron Then when people enter a dispute about content warning or no content warning, they can check their respective server rules and use that to settle it. E.g. if the rule were "content warnings are encouraged but not required. It is not recommended to chastise someone for their choice of content warning or not. It is encouraged to inform your followers about content warnings and when to use them..." Not necessarily suggesting that rule, just a rule in that vein.
@escarpment @Gargron
A lot of people will not realise that different servers have different rules, nor understand how content is shared between each.
What happens if my server has a very lax attitude to CW and yours is very strict?
Does your server block content from ours?

@Hairyloon @Gargron "In all cases ... in which a state shall be party, the Supreme Court shall have original jurisdiction." I dunno... I find it somewhat interesting that this is exactly the same issue with two states that have different laws.

The constitution forbids states from having certain laws. Other laws are enforced only within the state (posting at people on your server). Beyond state lines, it gets into federal jurisdiction.

@Hairyloon @Gargron Probably when communicating with people from outside your server, only the laws which apply to both servers apply...? Or only the more generic "federal" laws adopted by the fediverse Congress which meets once a year and has elected representatives from each server.
@escarpment I set up a server for just me. Do I get to come to this congress?

@my That's a good question to debate when constructing the founding documents. In the USA, we have a process by which other states decide when a state is a state.

Section 3 New States and Federal Property of United States
Clause 1 New States
New States may be admitted by the Congress into this Union