And Wikipedia has an overall left-bias, because of the demographic of contributors.
FROM YOUR LINK
Until 2021, we rated Wikipedia as Center, but changed them to Not Rated because the online encyclopedia does not fit neatly into AllSides’ media bias rating methodologies, which were developed specifically for news sites.
Wikipedia has a claimed positive-bias, in which negative things are often left out of the article. This is more true the lower profile the page is.
And Wikipedia has an overall left-bias, because of the demographic of contributors.
FROM YOUR LINK
Until 2021, we rated Wikipedia as Center, but changed them to Not Rated because the online encyclopedia does not fit neatly into AllSides’ media bias rating methodologies, which were developed specifically for news sites.