5. No NSFW content
I think this may ultimately give posters too much uncertainty about whether what they are writing down or linking to is OK or not, and it may discourage conversations we'd otherwise see which would be no fun; NSFW is a very broad brushstroke.
I see occasional threads popping up with "NSFW" in the conversation title.
Not that the conversation itself is, but the link may be.
Perhaps the rule should be extended to say no NSFW content outside of tasteful (non-obscene) content in a thread with (NSFW) in the title.
(Although that would not fully address.)
What some people view as NSFW varies, also; in some workplaces just porn / pictures a coworker might happen to see are the line between personal use of employer resource's and unacceptable usage (NSFW)....
Other workplaces are particularly strict, AND mere loading of a page with sexist or dirty jokes, sexually suggestive chatter- just plain text, Bitcoin itself, or any sort of unprofessional subject matter may be unsafe topics.