I'm a Linux user and I keep wondering why not many people use it. I guess because it's not so popular (got something to do with its marketing team then), and cause' Windows and macOS have been around for ages. Linux does have its advantage over Windows that I found very useful for my daily work, you can read more in this text: https://www.1and1.com/digitalguide/server/know-how/linux-the-cost-effective-alternative-to-windows/
Above all, I use it because most of the software package is free
People like to use Win 10 and Mac because it's intuition. One size doesn't fit all. If you're looking for a job, you must have an engineering degree. A bit disclosure- major companies want to hire engineers with "extra" software/computer programming background. They're very desperate...