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https://en.wikipedia.org/wiki/United_States_v._Microsoft
Judge Jackson issued his findings of fact on November 5, 1999, which stated that Microsoft's dominance of the x86 based personal computer operating systems market constituted a monopoly, and that Microsoft had taken actions to crush threats to that monopoly, including Apple, Java, Netscape, Lotus Notes, Real Networks, Linux, and others.
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However, the appeals court did not overturn the findings of fact. The D.C. Circuit remanded the case for consideration of a proper remedy under a more limited scope of liability. Judge Colleen Kollar-Kotelly was chosen to hear the case.
The DOJ announced on September 6, 2001 that it was no longer seeking to break up Microsoft and would instead seek a lesser antitrust penalty. Microsoft decided to draft a settlement proposal allowing PC manufacturers to adopt non-Microsoft software.
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https://en.wikipedia.org/wiki/European_Union_Microsoft_compe...
On 27 February 2008, the EU fined Microsoft an additional €899 million (US$1.44 billion) for failure to comply with the March 2004 antitrust decision.
Europe ruled that a primarily foreign company owed them 1.44 billion dollars and forced them to put out a product that no consumers wanted and retailers refused to stock.
Nothing I wrote and nothing the article wrote requires them to be a monopolist today. The OP said the article writer didn't know what monopoly meant. I'm pointing out that they know perfectly well what it means and that the OP merely disagrees with their conclusion.
That will be impossible in practice.
It is in a monopoly's interest to not be compatible, so they will make complex systems that will be expensive and take a long time to be bug-compatible with. And when the APIs are cloned, they will have gone to something else. All this will also be well locked down with patents.
The worst part (well, worst for me) is that the resulting systems will be unnecessarily complex and hence unpleasant to use for developers. That is, it lowers my life quality if I work with their systems.