I'm in favor of GitHub alternatives in general. When we looked at what moving or mirroring our repos off of GitHub would look like since their uptime has been falling, the real bottleneck was all the dependencies that still live there. If (when) GH has an outage and we NEED to deploy, we would have to be mirroring all of those dependencies in an accessible way to get a deploy out. In that (sort of) hypothetical situation, the lowest-tech hot fix would be a manual code-edit across servers.