Substack's leadership is engaging in "normative sociology," which, Robert Nozick joked, is "the study of what the causes of problems ought to be." Nazi ideas are a problem and #Substack *wants* the solution to be platforming (and monetizing) those ideas, so Nazi ideas are exposed more broadly, and receive more criticism. Of course, the data and historical record are overwhelming that this isn't at all the solution, and only makes the problem worse, but Substack has an interest in ignoring that.