I’ve seen errors on line 0 in the past

Nope, Mac OS as a Docker container, it’s a thing: https://hub.docker.com/r/sickcodes/docker-osx

Also you don’t need a Linux VM to run docker containers on a Mac host btw

When I was in school I once used a IOS emulator running inside a docker container of MacOS running on a linux machine. It works surprisingly smoothly.

But now they will actually be part of your username and show up everywhere.

Well not really, they added account wide display names for that