Who decides to commit changes though? A human. A human who can be corrupt
I’m not entirely sure what your getting at here, but git can be run as democratically as a crypto currency where the canonical version of the project is the one with the longest chain. Seems like a bad idea to me though. I think you may be assuming the way most people rely on github/gitlab etc as an inherent part of the system, when it’s really just the most convenient way of doing things.
The best use case for blockchains in my opinion is elections.
I’ll believe it when I see a real implementation. I think the problem is anonymity, I don’t see how we can set a system up such that the results are auditable but also impossible for anyone to tie a specific vote to a specific person.