That's true, and moot left right before things took their major turn (possibly precipitated by Gamergate, which moot soon banned all discussion of; he left about 6 months later), but 4chan /pol/ is still more extremist than even Stormfront, and nearly as uniform in terms of beliefs. It's not quite as bad as 8chan /pol/, but 8chan /pol/ is as bad as or perhaps even more extreme than Nazi Germany's actual "Der Stürmer", and is where a lot of the far-right mass shooters have posted.
Other boards have varying concentrations of /pol/ injected, with /mu/ ("Music") having a spread of far-left, left-leaning, right-leaning, and far-right posters, and /tv/ ("TV / Movies") and /biz/ ("Business / Finance", but mostly just cryptocurrency gambling/scams) being almost exclusively right-leaning, and mostly far-right.
Other boards have varying concentrations of /pol/ injected, with /mu/ ("Music") having a spread of far-left, left-leaning, right-leaning, and far-right posters, and /tv/ ("TV / Movies") and /biz/ ("Business / Finance", but mostly just cryptocurrency gambling/scams) being almost exclusively right-leaning, and mostly far-right.