André Staltz :

As a consequence, the Internet has allowed intermediate computers to rule. These are like parasites that have grown too large to remove without killing the host. The technical flaw that favored intermediate computers prefigured a world where middlemen business models thrive. Google and Facebook connect consumers with advertisement publishers, and charge fees for each ad. Amazon is a middleman business as well: it connects retailers with consumers, and takes a cut on transactions. Many popular ‘sharing economy’ startups and services are also middlemen: Airbnb, Uber, Kickstarter, Patreon, and many others.