There is not much demand to run Linux on Mac hardware.
Just like there's "not much demand" for
crate-engines, because Average Joe driver has zero interest in
building the goddamned car. Did you even read the OP?
The demand is to run an updated os on older macs that are no longer supported by apple.
(I consider "updated" OSes to be an inferior approach versus locating updated software that can be used in the faster OS the machine ran best with. And to hell with OCLP if they're not going to support HFS+ anymore.
I wish there was a "Linux" distro that was a rebadged hack of a debloated Mojave (with High Sierra and Tiger kexts) with all version-checking disabled so that any app, and the OS itself, could at least launch and succeed or fail on its own merits.)
Not everyone needs or can afford to buy a new mac when their old one still works fine.
Finances have nothing to do with it; the primary issue is that, aside from speed, Macs are getting shattier. Like almost everything electronic within the last half-dozen years especially, they are deliberately built to be actively hostile to user attempts to repair or upgrade, and to brick at OEM whim.