I did some research and the way SCP handles creative commons seems really unorthodox and shady. Like usually when you have licenses like this there's some sort of agreement when you join the site - that "by joining this site you are consenting to have any works posted released under creative commons" blah blah blah or something like that.
There is no such agreement when joining SCP. I scrolled through the applicant page and guide for newbies for an hour, really trying to find anything that would indicate to a new user that they'd be consenting to such a thing and was met with no results.
The only thing I could find was this message in tiny print at the very bottom of every page stating: "Unless otherwise stated, the content of this page is licensed under
Creative Commons Attribution-ShareAlike 3.0 License". However, this only vaguely implies you're releasing your works to CC by posting on SCP, and I've never heard of a website just 'deciding' your works are licensed under a certain agreement with no consent or clear statement.
Now if I haven't made some oversight, this means someone could (fairly effectively) plea ignorance to the existence of such a licensing agreement, given they never explicitly stated they were releasing their work under CC.
Wouldn't work for stuff like Keter Duty but you could probably knock dozens of articles out without a licensing tag as long as they can't prove you ever agreed to license it under CC, since there is nothing when you sign up or post to the wiki that inherently indicates you do it automatically.