> I have no idea why the hardware/software industry all focused on the linux kernel

I'll die mad about it.

So many in the OSS community applaud vendors for upstreaming a driver to the Linux kernel even though they haven't given any basic form of documentation. Not only is this a massive pain if you happen to work on a project that isn't GPL compatible (back to square one, legally required to clean room implement the algorithm if you want to work with Linux source), but you still have no idea how the device actually works and what the sharp edges are (good luck writing bug fixes!). It's utterly baffling that people have generally accepted Linux as if it is the only FOSS kernel that anyone should ever care about.