Despite being free, Linux hasn’t become a popular alternative to Windows due to several key factors. Adoption and software compatibility give Windows an upper hand, making it easier for people to use and rely on. The first-mover advantage has also helped establish a strong ecosystem around Windows, benefiting businesses and vendors who prioritize the platform. With widespread compatibility, familiarization, and dominance in the desktop market, Microsoft’s grip on users remains tight.
Source: https://www.howtogeek.com/reasons-most-people-stay-on-windows-instead-of-switching-to-linux