Really? XBMC? Or something else?
XBMC has been known as Kodi since 2014 when the name changed.
Kodi is the user-facing media box application. While it can
run on Linux systems Kodi itself has nothing to do with Linux as it runs on a variety of platforms (Xbox, Windows PC, Macs, various iDevices, FreeBSD, etc.). Remember that the original XBMC project was for Xbox (custom Pentium III running custom Windows NT). Linux support came later.
The operating system that I am running Kodi on is LibreELEC which is a great OS choice if you don't want to run anything but Kodi and you want to keep Linux at an arm's distance and not have to look at it.
LibreELEC is technically Linux (as in it runs the Linux kernel) but it's not a full fledged distribution. It's really an embedded device operating system like the Linux that runs my DSL router and my Super NES Classic. Gas pump POS terminals, et cetera. There is very limited functionality in LibreELEC beyond its support for Kodi and associated add-ons. Even some very common terminal commands like 'history' are missing from LibreELEC.
The pollster didn't include a poll choice that accommodates these embedded device situations. In my house there's a Roku and unused Chromecast (2nd gen) which might have Linux kernels. Not sure what my MFP (HP DeskJet printer) runs. My LG TV uses webOS which is also technically Linux but I don't think of myself as "running Linux" when I turn it on.
Despite the fact that I use devices every day that have Linux kernels, I don't feel like I am "running Linux" because I don't have to interact with it as a desktop operating system, something I'd like to keep. I boot Raspbian twice a year to check for Raspberry Pi 4's firmware updates and that's more than enough contact with desktop Linux for me.