Blockchain is not decentralised

I keep hearing an opinion that “Bitcoin (or any cryptocurrency, or blockchain in general) is decentralised”. It is presented as a “good” property of cryptocurrencies that distinguishes it from older fiat money such as US dollar. Most recently, by Balaji S. Srinivasan:
The people who complain most about filter bubbles are complaining about the plural: there was just one filter bubble they controlled, and now they’re annoyed there’s more than one. The complaint isn’t about filter bubbles, it’s about competing filter bubbles.
The answer isn’t reform, it’s radical decentralization. One component is citizen journalism, where everyone is a journalist, as opposed to corporate journalism. The alternative to the hereditary dictatorship running media corporations is experts write as a duty, not for profit.
A second component is decentralized cryptographic truth. With cryptocurrency, it is now possible for an Israeli and a Palestinian, a Chinese person, a Japanese person, a Democrat and a Republican to all agree on the state of the Bitcoin blockchain.
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