I'd argue that today we have an even larger variety in CPUs. They're all ARM, but they exist and almost anything can be made to run on them. Well, not trivial

I'd argue that today we have an even larger variety in CPUs. They're all ARM, but they exist and almost anything can be made to run on them. Well, not trivially, but it can be done. ARM is also supported by Ubuntu, Arch, Debian etc. The only problem is that most of ARM hardware is made just for phones etc, where *nix doesn't work great because of manufacturers and their closed-source firmware.