It's the whole web 3 concept of the community powers the infrastructure to run the community. It's an enticing concept, The people using the service pay with their CPU and internet connection to use the service. It makes what would be a rather expensive infrastructure almost free.

With blockchain they're doing some smart things, you can wrap code around the ledgers, in the end it's just varying fancy levels of receipts verified and secured by the community. It's verifiable but anonymous.

But then you've got cryptocurrency doing complex math burning through tons of electricity looking for unicorns to add to the ledger, in a massive pyramid scheme. Okay, it's not exactly a pyramid scheme. Whoever starts a given currency makes the vast majority of the money off of it when the coins are easy to find, but at some point it is pretty close to any other given financial system, with the benefits of being anonymous and verifiable.

The bitcoins are just entries on the ledgers. But then s*** like NFTs are on ledgers. Someone sells you a receipt for a JPEG on a URL. It's all only worth what someone will pay you for it. And without a whole bunch of regulation, it's not exactly a safe market.

One is the tech, the other is an example of a type of the tech. A square is a rectangle, but a rectangle is not a square.

For most applications, this isn't necessary:

There are some examples like in biotech/finance that I personally believe will require a blockchain to be truly "fair" at the end

Nothing particularly useful though. It's a very slow, inefficient, trustless, immutable database. There really aren't many good applications for that.