> First, IBM didn’t make the most of its dominance. It did little to make the IBM version of the PC truly unique.

Remember IBM had gone through a very painful antitrust case and was still subject to the consent decree. I’m not sure right now of the terms, but it certainly limited the leverages IBM could apply against third parties profiting from the PC.

There was still an antitrust case in process against IBM in 1981 when the PC was launched, it would only be dropped by the US in 1982. I started in 1990 and the fear of another antitrust case pervaded everything through the ten years I was there, even after the earlier consent decree expired.