Unless you're running Alpine Linux or similar of course. Nowadays the GNU tools make up a small (if important) part of a Linux distro. There's also alternatives.

Still has nothing to do with Linux. Look at "Skills Employers Seek in 2025." What does Docker or Kubernetes have to do with Linux?

Typically, Docker and Kubernetes run container images based on Linux and run them on top of Linux servers. I can say from my experience using Kubernetes to run Docker containers that having separate Linux experience is very helpful

4 decades on and there are STILL people trying to get everyone to say “GNU Linux”.

Everyone knows Linux is the kernel. Nobody CARES.

Everyone says GNU Linux. The target is called x86_64-unknown-linux-gnu.