But, They seem to be saying that because Xerox invented Ethernet (Along with DEC I might point out) that they invented the internet. The Ethernet that xerox invented ran on RU6 coax, about as thick as your thumb, and was good for a distance of 100 Meters. It seems if you want to give Xerox credit for the internet you should at least mention XNS which was an internetworking protocol.
Going back to the bad old days, we really have to give TCP/IP credit for connectiog computers. Prior to TCP/IP the IBM mainframes ran SNA; the Vaxen used DECnet; the PCs were running either Netware (pretty much the same as XNS), NetBios or Vines; Apples were running AppleTalk; and I can't remember what Sperry/UNIVAC called thier protocol. TCP/IP was the first protocol that actually allowed all of these systeem to talk to one another. (I don't mention Suns and BSD because ther were allready running TCP/IP)
As for the growth of the Internet after it was privatized. It was growing expontentially when it was DARPAnet, it continued to expand expontentially as NSFnet, and it continued to grow after privitization.