There's been a recent batch of marking various questions and answers as community wiki, e.g.
I personally don't see much reason for these CW markings. One mod declined my request to reverse one such marking with the comment:
Whether a post should be community wiki is mostly up to the original poster. I see no reason to revert the CW status, feel free to raise it on meta if you have a compelling reason.
Should posts be tagged CW depending mostly on the whim of the poster, or should there be some kind of guideline for this?
(I see there is only one substantive discussion on such a matter here on this meta, under this tag. And the suggestion to use CW in that use case [for answers changing over time, e.g. "what is the latest X"] was basically rejected. On the other hand, there is a non-CW-tagged meta-question about incomplete lists where this approach was suggested. However the three posts I listed above don't quite seem to be lists--of two of them I'm pretty sure--I mean numbering your paragraphs in an answer doesn't make it a list except at a very superficial level; the last one [about slavery worldwide] is more debatable, but it was quickly closed by another mod as too broad after one mod tagged it CW.)