Oh, so it's a barrier-to-entry argument? That makes more sense. The barrier to doing something with postgres is pretty low, so competitors can more easily copy

Oh, so it's a barrier-to-entry argument? That makes more sense. The barrier to doing something with postgres is pretty low, so competitors can more easily copy your ideas unless there are more barriers somewhere else. An interesting point. More broadly: if what you're working on is not hard (and awkward), then others can copy your idea easily. Technology like postgres makes a new class of problems easy, and thus you need to find new problems to solve if you want a sustainable business.