[xaerise]

With that logic, Why not count BSD as one? Linux is the kernel, but Debian has Gnu/HURD also.

Linux in that list is flavour, but that is also the same with BSD. BSD is the flavour and Free, Net, Open all come from BSD 4.3. And if we really want to push it, it also includes MacOS 10.

https://i.imgur.com/RgkVBgR.png

[ploek]

The BSDs have diverged significantly since then and not just in userland. Unlike Linux distros they do not all have the same kernel. There are of course common parts in their kernels, many of which date back to Unix, but there are also big differences between all of them.

I was also surprised to see Sailfish OS, Meego and Maemo listed separate from Linux, but my guess would be that the list comes from the build system of curl. Everything that is its own build target is listed there.

[rightbyte]

Obviously, Metallica is not really metal ...

[pjmlp]

I still remember the uproar when they decided Metalheads can also use short hair, so...