Utter garbage. Without initial development by the defence department in the US and other countries, and continued state support of related technology and infrastructure, your precious private sector wouldn't have done a thing.
Your knowledge on this subject is very inaccurate.
To look at the example of the Internet, neither the government nor anyone working for the government invented it. This was pioneered by two computer scientists in the 1960s, who also happened to be college professors. The governments main involvement with the Internet did not occur until the Vietnam War, and the primary purpose was to utilize an unknown technology to send information that had very little chance of being intercepted since it was unknown.
However, during the war departments use of the Internet, very little, if any, advancement took place. It was not until the private sector took over in the 80s that the Internet began to expand and people other then those at the War Department started to learn about it.
Insofar as the infrastructure, the Internet in the beginning utilized the phone system, which was built and maintained by private business. There could be argument that the government played a roll here since Ma Bell was a government entity, however that is not exactly true since Ma Bell was never a government entity (another common misconception).
When the telephone was initially invented, a few people in the business realized that competing telephone companies in the same locale would produce an ungodly amount of telephone wires, that would be unsafe, inefficient and non-aesthetic. So, being the smart business men they were, they realized if they unite, they could approach congress and convince the government that a centralized (monopoly) communication company would be much better for the American people, and, if congress bit, become incredibly rich. Congress of course bit, and Ma Bell was born, albeit a highly regulated private monopoly.
(Now for the nay sayers who insist monopolies are un-american and congress would never allow such a thing, almost all pro sports in the country are monopolies. The NBA is the only company that provides professional basketball entertainment, the NFL is the only company that ... so monopolies are more common in the USA then one might realize.)
Now the Internet relies on cable wiring, another privately maintained infrastructure, which is my area is controlled by Comcast, and fiberoptics, privately maintained as well, which in my area is controlled by Verizon.
All businesses and major institutions behave in this manner. For the most part, government causes stagnation and private sector performance institutes growth and efficiency.
Another great example is the USPS vs. UPS & FedEx. It is no secret that the USPS is in deep trouble, and it is not that the system could not be improved, it very much can. However, for it to be improved would mean more centralization and automation, which will kill jobs, initially at least. Since any change in the USPS needs to be approved by Congress first, nothing is happening, because no Dem or Rep wants to be known as someone that killed 1000s of post office jobs.
Another example, look how well the air industry flourished after it was deregulated.
Another example, the railroad was built by private industry as well. Sure, the government did provide loads for its expansion in the 1860s. However, expanding the railroads helped the North immensely defeat the South, so there was a great incentive to provide those loans. In the end though, the amount of shipment fees the railroad made from Standard Oil in the tail end of the 1800s was far in excess of any amount loaned by the Government, which means the rails would have been built regardless.
Retouching is super boring and I need to listen to something. Most of the time it is historical documentaries, which are interesting enough to break the silence but not so interesting to distract myself to a great degree. PBS's 6 two-hour episode special on the Civil War and 8 two-hour episode special of the American West are really good ones.