Like, Vim and Emacs keybindings? Or real Vim and Emacs? It's quite different xD

They let you ssh in. So you can run vim/emacs on the machine if you want.

You can ssh in and run actual editors.

Okay? That's three editors and there are hundreds of others (though probably <25 that are used by more than a few people). There are sizeable followings for other CLI editors like Neovim, Kakoune, Yi, etc.