So it's either all or nothing? It's possible to concede some privacy in some aspects of work/life while trying to retain it in another. Even though you have a Github account doesn't mean that all your code is on Github. You might not have remotely close to all the work you do in an editor on Github, at least if you're the kind of person who's more comfortable in your favorite editor than in a word-processor. People have been power users of editors for decades without needing the cloud or a remote, third party service in order to use them.
I was addressing the reaction. Github has been using GA for years and AFAIK there is no way to opt out via Github account settings. Atom is not something you use on Github; it's a desktop application. If you install a browser, you have the option to NOT send data to the browser vendor, but most people choose to use the default settings. I don't see why we have to think auto opt-in is bad or a bummer. Github even makes it explicit that you can disable GA (or whatever metric software they are using in Atom) in Atom and atom's opt out option is 100x better than Google Plus integration.