This business model is the reason that FB, T and G are dominant platforms worth discussing. Products that are purely transactional are easy to compete with, splitting up markets and driving down prices. This is why true "common carriers", like ISPs, have fought desperately against net neutrality and to capture more customer data -- they want in on the value capture that comes from shaping content, because they are rapidly being commoditized as carriers of bits.

IMO this is a moat in the eye of a lot of libertarian tech philosophy. Most software products become competitive by building networks -- with end users (e.g. social networks), with developers (e.g. open source), or indirectly via content (from media aggregators to spam filtering). Once you're in the business of curating a network, you are implementing values whether you acknowledge them or not.