It's only fashion. There're no hard facts why someone should prefer it to vim, notepad++ or sublime or even a proper IDE like a Jetbrains product or Visual Studio.
Great job from the Atom team for such an outstanding editor. Our whole company switched over from IntelliJ and never looked back. Everyone is totally thrilled.
Only few things prevent greedy companies from pushing further and further. Bad PR is one of them. I don't care about Tayler Swift, but I think the behaviour of the big players are extremly questionable.