https://larrysanger.org/2020/05/wikipedia-is-badly-biased/
He provides some prominent examples in the articles about Presidents Trump & Obama and ends with this:
It is time for Wikipedia to come clean and admit that it has abandoned NPOV (i.e., neutrality as a policy). At the very least they should admit that that they have redefined the term in a way that makes it utterly incompatible with its original notion of neutrality, which is the ordinary and common one.4 It might be better to embrace a “credibility” policy and admit that their notion of what is credible does, in fact, bias them against conservatism, traditional religiosity, and minority perspectives on science and medicine—to say nothing of many other topics on which Wikipedia has biases.
Of course, Wikipedians are unlikely to make any such change; they live in a fantasy world of their own making.5
The world would be better served by an independent and decentralized encyclopedia network, such as I proposed with the Encyclosphere. We will certainly develop such a network, but if it is to remain fully independent of all governmental and big corporate interests, funds are naturally scarce and it will take time.