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.
Allsides, that rates media outlets, doesn’t give a media bias rating. However, that page I linked still shows the bias even if it doesn’t get them a media bias rating.
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.
Allsides, that rates media outlets, doesn’t give a media bias rating. However, that page I linked still shows the bias even if it doesn’t get them a media bias rating.