bookmark_borderEnd of the Operating System License as a Business Model?

Today, I was reading an article about the history of Unix. When I came across this paragraph, I had an intense instinctive and natural reaction:

Sun was already a success (with imitators!) when, in 1983, the U.S. Department of Justice won its second antitrust case against AT&T and broke up the Bell System. This relieved AT&T from the 1958 consent decree that had prevented them from turning Unix into a product. AT&T promptly rushed to commercialize Unix System V—a move that nearly killed Unix.

My reaction was: “Whoa! How can they think anyone would want want to pay for an operating system (OS)?

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