They have a tiny market share worldwide. Apart from the USA not many people in the world own them.

# Worldwide shares:

- Windows: 74%

- macOS: 16%

- chromeOS: 2%

# NA shares:

- Windows: 63%

- macOS: 26%

- chromeOS: 5%

# Europe shares:

- Windows: 76%

- macOS: 16%

- chromeOS: 1%

# Asia shares:

- Windows: 80%

- macOS: 8%

- chromeOS: 0%

--

So if we only take NA + EU

- Windows 69%

- macOS 21%

That's not bad at all

Source: https://gs.statcounter.com/

EDIT:

Asia doesn't make lot of sense, they are more of a smartphone oriented market than desktop

Asia:

https://gs.statcounter.com/platform-market-share/desktop-mob...

What's interesting, smartphones became the most used type of device last year

Worldwide:

https://gs.statcounter.com/platform-market-share/desktop-mob...

Today:

Smartphone: 54%

Desktop: 42%

And if we compare Windows vs iOS in NA:

- Windows: 31%

- iOS: 27%

- macOS: 13%

So yeah, it doesn't look good for windows and microsoft

Exclude business PC’s and OSX’s market share is surprisingly large. Tablets and smartphones have eaten into the ultra cheap PC sales in a big way which has been shifting the market.