It's because software was free back then. Hardware was so bizarly expensive and rare that no one gave a damn about giving away software and software ideas for free.
As someone who was working in the computing milieu back in those days, let me tell you that you have THAT comment completely wrong! Back in the old days nobody gave anything away, unless you might share something with the guy at the next desk working in the same shop. You might share something with a colleague at another university, say, but realized that you did not know how to set it up to run on his particular computing system.
Back then, every manufacturer of hardware tended to create their own OS and compilers. It was very hard to share software of any kind because unless you had a machine from the big guys (IBM) there was just not enough of a common market to make the headaches worthwhile. Remember it took people to take the orders, pack the product, and ship it out. There were no online servers where one could make an online request and download the result. Delivery of software was often done in the form of punchcard decks, or maybe on a tape that turned out to not quite work on your tape drive. Typically, if one could find software available (I am talking about libraries and tools here, not big accounting packages.) and make it available on your machine, it would be maybe "almost" useful, but require you to go in and tweak it somehow.
By contrast, today I can sit at my home computer half a world away from much of the software is and select and easily acquire massive useful packages of free high quality software that can help me create amazing things sitting in my home office. That is something I could never have done 50 years ago.
Money will say more in one moment than the most eloquent lover can in years.