Seems like every company claims to be harnessing some type of network effect in their business model.
This post goes in-depth at defining and comparing different forms of network effects, diagramming them in a radial pattern — from more to less defensible as you move outward. A helpful reference guide.
Most companies’ advantages aren’t cleanly put in a single bucket, the total picture of the business has factors in multiple boxes. This guide is a useful companion to Advantage Flywheels in describing business models.