[EazyC]

As others have mentioned, the one main distinguishing factor between blockchains and git (at least in practice because bitcoin's POW makes rewriting the chain expensive) is the consensus among its general users and in inability to actually change the history of the blockchain. Mathematically they are very similar, but git repos aren't "secure" in the same way. That's why I would argue against the author that git isn't the most valuable blockchain in use today although it could very well be the biggest.