Whether it was luck or hard facts, Docker became the standard and default nearly to a point where juniors only knowing how to program a "Hello World!" webservice will dockerize it. It's an ubiquitous technical skill like basic SQL.
As someone who has very low interest in container technology itself, I have zero reason to inform myself about QUEMU..
https://qemu.org is VM host software, like VirtualBox, but FOSS. Instead of a Dockerfile I have a shell script spin up a VM and install the dependencies for me.
They both serve a similar purpose, isolate guest userspace from the host and provide reproducible environments. Instead of a Dockerfile I have a shell script that spins up a VM and installs the dependencies for me
