The issue is the people switching are the kinds of people who set up family computers and recommend things to others. So there is this huge hidden knock on effect of people going from pro-windows to nutrual or recommending a different os.

In the simplist terms, it's a similar reason youtube allows users with ad blockers, those people with ad blockers will still share videos to people without ad blockers.

Very short-sighted move from Microsoft. All of this gain now from ad revenue but long-term damage to the brand.