Yes the wiki was invented by an "uncaged lion", but it was built on over 3 decades of advances by employees of large organizations: Andreeson was an employee of NCSA at UIUC or some other university when he wrote Mosiac. Tim Berners-Lee created the WWW while employed at the big European organization for high-energy physics (CERN). The TCP/IP stack was first added to Unix by grad students and faculty at Cal Berkeley, funded by the US government. Almost all pre-WWW internet software was written by employees of large organizations. E.g., the traceroute utility was written by an employee of LLNL. Sendmail, a grad student at Cal. Earlier mail servers and user agents were written at RAND Corp (which is only medium-sized but is funded almost entirely by the government). The first mailing lists, SF-Lovers and Human-Nets, were started by employees of large organizations and populated almost entirely by them for the first two decades of their existence. The end-to-end argument and the notion of the IP layer were formulated in the early 1980s by employees of large organizations. The father of the internet, J.C.R. Licklider, worked for large organizations his entire life (MIT, Dept of Defense). The first internet hosts were developed by medium-sized defense contractors: BBN was one.
The first entrepreneurs to significantly influence the evolution of the internet were probably the founders of SUN, most of whom came from Cal Berkeley and worked on those government contracts to add a TCP/IP stack to Unix. (The main contribution of SUN to the internet that I know of was to accelerate the number of internet users: every SUN workstation came bundled with internet software -- probably the first time that a marketing department helped drive internet adoption.) After the founding of SUN, not much entrepreneurial influence on the internet that I know of till the internet gold rush starting 1993 or 1994, which was 33 or 34 years after (planning and research) work started on the internet/Arpanet. I know UUNET was an entrepreneurial venture of the 1980s: I am unfamiliar with whether or how UUNET influenced the internet though. In 1992, entrepreneurs/lawyers Canter and Siegal invented spam, but spam is hardly a distinguished contribution.
Also, Engelbart worked for TRW or some other defense contractor (a large organization) and then SRI (medium-sized but funded almost entirely by the government) so pointing out that he was never an employee of Xerox does not exactly score a point for the uncaged-lions side of the ledger.