The similarity goes deeper than that, given that git uses Merkle trees as does Bitcoin. There's hashing and in the typical use case there is even some distributed consensus process involved although often in git human decision making takes the place of an algorithm.
I think the water gets muddied by people who know very little and yet have an opinion as well as by people who know so much they can't see the forest for the trees (if you'll allow the pun).
It makes me realize that git is probably some kind of append-only database too (and used for decentralization too).
I guess I can still thank blockchain for having introduced the idea to me.