Why no one writes their own OS

Have you ever wondered why we don’t have more than a couple of mainstream options for operating systems, or just wondered what goes into writing an OS? Well, in this video I cover just that – and a few extra bits of info on Linux, Windows and more.
Sources:
https://en.wikipedia.org/wiki/Kernel_(operating_system)
https://en.wikipedia.org/wiki/Operating_system
https://en.wikipedia.org/wiki/Unix
https://en.wikipedia.org/wiki/Linux_kernel
https://en.wikipedia.org/wiki/Microsoft_Windows
https://github.com/cfenollosa/os-tutorial
https://brennan.io/2015/01/16/write-a-shell-in-c/
https://github.com/GNOME/gnome-shell
https://github.com/torvalds/linux/tree/master/kernel
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Disclaimer:
TechteamGB assumes no liability for damage, misuse or misunderstanding of the information contained in this video. Use this information at your own risk. TechteamGB cannot guarantee any particular result from the information contained in this video, and all information was presented as correct as of filming. TechteamGB accepts no liability for information being proven incorrect after the creation of the video, and all information should be taken as opinion and guidance, not fact. This video was not sponsored by anyone, and TechteamGB does not accept monetary – or non-monetary – benefits to alter opinions or results.