Bray's piece is largely notable for the fact that he's calling attention to this trend -- it's something which you
should be paying attention to, if you're in tech, or if you're one of its critics. (And quite possibly both.) But there isn't any analysis as such.
I'd like to suggest a possible thread tying numerous elements of this together:
1. Technology companies tend to become monopolies.
2. Tech companies tend to become power centers.
3. Monopolies are associated with economic rents -- returns above the ordinary economic costs of production. (Contrast commodities or wages, or even more so, public goods.)
I've been putting thought into just what technology is, or more specifically, what mechanisms technology operates through. Among those are network and control systems (I'm still trying to decide if that's one element or two). Networks are any set of differentiated nodes connected by some relationship and flows (energy, material, information, forces, some mix of the above).
Networks may be physical (transport, communications), logical (webs of knowledge, marketing networks), or a mix of the two. Various network and dendritic structures include cities, roads, rivers, shipping routes, and the like.
Because of scaling effects, absent other considerations (and these do exist), a larger network typically has the advantage over a smaller one, and very often tremendously much so. In particular, by both providing low price options and controlling access to critical resources (or paths or nodes), network structures can exert considerable power.
That is: networks (physical or logical) are monopolies, and provide economic rents, through the mechanism of power and manipulation.
And this seems to be fundamental and intrinsic.
(I'm still developing the model. I'm interested in constructive challenges. More discussion: https://redd.it/71i231)