Welcome to the internet! You must be new here :)

Jokes aside, using any proprietary web service has the exact same downside. And yet here we all are using Google Apps, Dropbox, GitHub, HipChat, Intercom, and dozens of others. As a team, we found additional web services add exponentially increasing complexity; we eventually needed a platform to keep track of all the platforms we were using. So we back-tracked and went the same route as the Wiredcraft guys, centralizing everything into GitHub.

As a community, instead of advocating turning the clock back (which will never happen: the toothpaste has exited the tube), we should explore ways to satisfy security & reliability concerns while maintaining convenience. Also, you can self-host GitHub.