Since 2017, Wikipedia editors have compiled a list of news sources from which articles are highly likely to employ systematic bias, lack professional editing and/or journalistic standards, regularly misrepresent sources, and/or fabricate information.
While its list is by no means a complete list of publications with the aforementioned problems, it has helped make Wikipedia articles more reliable by basing them off of sources covering the same events and information from a more objective and factual point of view.
To make Lemmy news communities better than their Reddit counterparts, I think avoiding links to those sources in favor of more reliable alternatives would be worthwhile.
For those worried about blocking certain viewpoints, it's important to note that the sources on the list aren't there for the unpopularity of their opinions, but rather the frequent publication of misinformation. For instance, Fox News, despite its frequent bias, is not one of the publications on the list.