Whilst Visual Studio Code is "open-source" (as per the OSD) the value-add which transforms the editor into anything of value ("what people actually refer to when they talk about using VSCode") is far from open and full of intentionally designed minefields that often makes using Visual Studio Code in any other way than what Microsoft desires legally risky...

Queen Mary University had an important role in the history of the Vim editor. It was here that, in 1973, the first UNIX system of the UK was installed, and it was also here that professor George Coulouris developed an editor called em. The creation of em ended up snowballing into the development of vi and many other vi clones after that.