Ridiculous post. Windows is a monopoly because Microsoft builds it to be anti-competitive. They were sued by the US govt in the 90s for the exact same shit they still do. Making their shitty browser impossible to remove. Forcing you you use it. Making it complicated to install competitive software.
The Microsoft antitrust case came to be one of the high-profile cases a few decades ago. In the 1990s. U.S. federal regulators sued Microsoft
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It's only due to the insane legalized bribery in the US government that Microsoft was not split into OS | Other divisions.
It's bizarre that you specified "Chrome/
Chromium" since Chromium undermines the case that Google/Chrome is a monopoly. If Microsoft made a Chromium version of Windows that took out all the anticompetitive shit, AND released it for free, there would be nothing to discuss.