Reasons someone using a PC should change from Windows to Linux?
Linux distros have more respect for your privacy.
Just run Wireshark on both Windows and Linux; you'll see that Windows loves to constantly chat with MS-servers.
Average Linux distro is completely silent until you choose to interact with the internet.
Being the product vs. using the product.
Linux gives you control & transparency. Easier and more secure usage.
Linux Geeks doing what Linux Geeks do..