If you search for “Microsoft edge open source” there will come out a lot of blog posts from five years ago praising a Microsoft Press release that announces that edge is open source .
But then, there’s no actual repository, the GitHub is empty, there’s only the MIT license and that’s it
So, they publish the source somewhere or it’s just marketing?
I guess it’s marketing and smoke on the eyes, unfortunately.
It could be that sources are actually available somewhere but I couldn’t find them either.
Chromium is open source and thats what Edge (and Chrome) is built on. So yeah you cant really say that Edge is directly open source I guess.