I just stumbled over this project:

https://libre-soc.org/

MMIX is created by Prof. Knuth purely for expressing his algorithms. Back then C++ and Java were the latest, hottest sh... (and would soon be outdated themselves). Prof. Knuth didn't like C++ and general programming language fashion. So he invented MMIX. It was never meant to be implemented in real HW.

I don't know whst's wrong with the other CPU architectures you listed. I especially wonder why Sparc wasn't used more.

I don't know of an industry company who builds truely libre hardware. Only half-libre if you are willing to call it so.

Which region are you willing to work in?

I don't think you need a particular order.

Windows -> GNU/Linux

KDE/Gnome -> JWM

TV -> Reading books

Twitter -> Fediverse

Coke/Cola -> Tea/infusion

Amazon -> Local bookshop

I myself eat less meat and plan to finally reduce it to zero. And I think it matters both for the environment and the animals.

But how does plant-based diet reduce waste (as the diagram seems to imply)?

I like the diagram/picture with the two ladders.