What I am worried about is that many of the “fake news” sites were blatantly alt-right in nature. There is a lot of media skepticism on the alt-right — those who doubt the veracity of stories in the WSJ, CNN, NYT, etc. — and believe that they use the news to promote a political agenda.
If the result of this weeding out of “fake news” is that only the outlets that the alt-right are already skeptical of, you’ve effectively forced them to assume that there is a wider conspiracy to keep out any news but lefty propaganda. At that point, it’s almost like you did nothing at all.