Microsoft will end public support for Windows 10 on May 14, 2024.
Windows 11 only supports PCs that have specific requirements that have only been widely available since mid-2016 (such as TPM 2.0).
Between 2010 and 2016, there were 300 million PCs sold per year, or a total of 2 billion PCs sold, most of them with Windows.
Probably half of these PCs still work perfectly. If they are properly optimized, their power is still more than enough for most home uses: browsing, watching videos, reading emails, playing some simple games...
This means that in one year, due to Microsoft's bad practices in planned obsolescence, 1 billion computers will not be maintained anymore.