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By all means, #movingtogitlab-dot-com does not solve the problem GitHub has (centralization), and moving to a privately hosted GitLab re-introduces the problem GitHub mostly solved (separation).
#GitPub is trying to solve this problem by defining a federation protocol for git services: https://github.com/git-federation/gitpub
@jomo it does solve it in a way. You can always move easily to your private instance. Except if they suddenly turn evil and remove the export function.
@jomo Issues and wiki don't migrate like that...