[kevinios]

(...) we need to separate the usefulness of the underlying technology called “blockchain” from the mania of people turning bitcoin into a big dumb lottery. Blockchain is simply a nifty software invention (which is open-source and free for anyone to use), whereas bitcoin is just one well-known way to use it. (...)

Will just comment on this sentence: careful here, blockchain is just one of the technologies that Bitcoin uses. But there are other important elements to Bitcoin, such as the concept of decentralization. A company or a bank can use blockchain in a centralized manner. This video by Andreas Antonopoulos (bitcoin advocate) helps make the distinction: Bitcoin vs. blockchain (https://www.youtube.com/watch?v=kHbtp7pOftU).

From the video description: "Blockchains are only one of the foundational technologies. In an attempt to co-opt the interest around Bitcoin, companies and governments are trying to circle the square by creating centralised and permissioned versions while entirely missing the point: decentralization."

PS: That being said, Bitcoin is not the only cryptocurrency using blockchain and decentralization.