How is Wikidata CC0?

The Cunctator <[email protected]> Sun, 17 Jun 2018 21:46:03 -0400

Newsgroups	gmane.science.linguistics.wikipedia.misc
Message-ID	<CACOqVVvExmFo3vcaU0Hn3oAfrT562co84eoXHXtcgg2Rxes+hw@mail.gmail.com>

If it's pulling from Wikipedia (CC-BY-SA) what is the justification for
converting the license to CC0?
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