The rules were never a formalized thing. A person that declares Crocker's rules is basically saying that they (1) want people to not filter their communication with them in any way for the sake of pleasantness and (2) take full responsibility for and ownership of their reaction to that unfiltered communication.
(The article references a source on the SL4 mailing list, but that is not the origin. SL4 post-dates Crocker's Rules, and the people that moderated and ran SL4 were all on the old Extropians mailing list.)
You don't need this to be popular. In fact, the lack of the idea's popularity may be advantageous. You get a chance to extract marginal information over what other people will get from the same person.
It's pretty much:
- What are you thinking about?
- I can't tell you. You'll laugh.
- I promise I won't.
- Okay, it's this thing.
> By declaring commitment to Crocker's rules, one authorizes other debaters to optimize their messages for information, even when this entails that emotional feelings will be disregarded.
IIUC, the article is just worded rather confusingly.