But many other people who know about the dangers still seemstrangely silent. When pressed, they trot out the “this is nothing new”riposte—as if awareness of what could happen is response enough.They tell me, There are universities filled with bioethicists who studythis stuff all day long. They say, All this has been written about before,and by experts. They complain, Your worries and your arguments arealready old hat.

Venkatesh Rao thinks that the Nazi bar analogy is “an example of a bad metaphor contagion effect” and points to a 2010 post of his about warren vs plaza architectures. He believes that Twitter, for example, is a plaza, whereas Substack is a warren: A warren is a social environment where no participant can see beyond their little corner of a larger maze. Warrens emerge through people personalizing and customizing their individual environments with some degree of emergent collaboration. A plaza is an environment where you can easily get to a global/big picture view of the whole thing. Plazas are created by central planners who believe they know what’s best for everyone.