I'm not even sure that all these "fake news", "alt right" exist. And isn't 4chan something from the past like Myspace, is there still any active users? Or there left only 2 insane anonymouses who write all the posts?
BuzzFeed News tracked down and spoke to Macedonian teenagers who created over 100 fake news sites, who readily admit it. They were pro-trump sites because pro-trump stories made the most money, not because of any political ideology.
https://www.buzzfeed.com/craigsilverman/how-macedonia-became...
>"Yes, the info in the blogs is bad, false, and misleading but the rationale is that 'if it gets the people to click on it and engage, then use it,'" said a university student in Veles who started a US politics site
Garnered intense notoriety and then used that infamy to push their real journal.
The clickbait and listicles are only to keep the lights on.
https://trends.google.com/trends/explore?date=all&q=4chan,re...
4chan seems to slowly be trending down.
The giant spikes on both reddit and 4chan were when the nude photos of Jennifer Lawrence were leaked. It's kind of hilarious to put that in perspective.
Anyway, from that we can conclude that the alt right from 4chan that has been blamed is probably unlikely at least as the main community.
4Chan spiraled into depression after countless controversies that spoiled its ethos.