Because sometimes people don’t go out of their way to buy Linux but want to repurpose old stuff they already own to experiment a bit and/or extend its life? For instance, I recently installed Ubuntu on my 10yo Intel MBP from 2015, and had to tweak lots of things to get it to a somewhat usable state that doesn’t flicker/tear/freeze. Had to use X11 instead of Wayland for anything Chromium-based. One of the most amusing ones (for some definition of amusing) is Bluetooth audio not working, turns out Ubuntu uses hot garbage codec that can’t fit into the available bandwidth due to AAC licensing (?), possibly among other problems, and switching to an AAC-enabled build made it reasonably stable.