> businesses can hope to have access to consumer eyeballs for several hours a day
Is this a case of inventing the facts to fit the story?
ISTR there used to be a company that had access to the eyeballs of a large proportion of the country for several hours every day. They were called ITV - though I don't know what ever happened to them. once their competitor corporation discovered they could screw up the commercial business model by giving away for free (i.e. sans annoying advertisements) exactly the same content.
The moral being that while there may be a new monopoly in town, one should never underestimate the capricious nature of the public. All it takes is a change in the wind (or privacy, or advertising nusiances - or the next generation wanting to distance themselves from "their parents internet") and all of that hard-won "market share" can disappear. Just look at the junk heap of generation#1 internet companies to see what can and does happen to all the success stories, eventually.