I always chuckle when people complain, even if it is from a cofounder, that Wikipedia has a "leftist" bias.
Gosh, you built a system that is dependent on a gigantic army of volunteers who donate their time and expertise freely for the sole purpose of building something for the communal good, and you are surprised it has a "leftist" slant?
That seems disingenuous. It purports to be a repository of facts, not a repository of the contributor’s opinions. Had the messaging up front been “a place for leftist opinions” it would be fine.
Gosh, you built a system that is dependent on a gigantic army of volunteers who donate their time and expertise freely for the sole purpose of building something for the communal good, and you are surprised it has a "leftist" slant?