I mean, it doesn't magically appear on the device. You pay for the installation, it's just included in the price of the device (with Windows you also pay for the license key, by the way). There are companies that'll install Linux for you. Hell, pay me $30 and cover shipping, I'll gladly set you up with, I don't know, Fedora and even add a timer with notifications that'll nag you about package updates, just like Android does.