It would be helpful to drive an actual discussion if you were explicit about what you find so objectionable about Krugman's argument. Is it that he dares to criticize someone behind Substack using Substack? If so, that seems overly simplistic. One can appreciate the platform and look to benefit from it while thinking other activities of the person behind the platform are worth of criticism.

Or is your problem that Krugman criticized Andreessen's foray into monetizing monkey JPGs, despite Krugman presumably lacking appropriate monkey JPG industry credentials? Again, if so, it would be more helpful to outline why you think Krugman is wrong instead of substituting umbrage for argument.