It turns out that commercialization is most of the work of creating a globally decentralized system. Which doesn't mean the non-commercial work wasn't critical.
What organizations do you think created the switches, routers, servers, software, fiber optic backbones? Who created the new protocols?
It was companies like AT&T/Bell Labs, Cisco, 3Com, Sun, UUNET, Netscape, AOL, the major telecoms, and a thousand other companies we don't remember.
Something like 1% inspiration from academia and government, and 99% perspiration by people working inside companies.
3Com, raised $1.1M from three venture capitalists in 1981.
Sun, a Kleiner Perkins portfolio company.
UUNET, raised from Accel, Menlo, and NEA in 1993.
Netscape, backed by Kleiner Perkins.
AOL, backed by Kleiner Perkins.