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
To be clear, I do think that #movingtogitlab-dot-com is the right thing to do for now. Not because of Microsoft, but because GitLab – as a company – is as transparent as can be, and actually open source, which GitHub is not.
@jomo GitLab isn't entirely open source, though, they're still somewhat open core last I checked, no? I mean, yeah, on the spectrum of these things GitLab is definitely significantly better than GitHub. But it's good that major Free Software projects continue to often maintain their own infrastructure. Defining standards for decentralized interop layers is definitely the next step, very excited by the prospect of Git+ActivityPub :)