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> Blockchains solve the problem of having a decentralized public database.

That's not a problem. A problem is something like this: "as a video editor/doctor/..., I need something that helps me...".

Yours is just a tech description.

A decentralized public database is a solution, not a problem (snark aside about bitcoin). The question is "What is the purpose of it being decentralized and public?".

What problem does a decentralized public database solve?

As far as I can tell, over a decade in, blockchain is still hunting for one.

So like git?

But you host git on a centralized server, blockchain git when

That’s github model, you can host it on many “servers” if you so choose

It's not guaranteed to be unique. Blockchains are.