Understanding the centralization as "controlled by a company" or "controlled by a small group" is a good start. I am talking about one step further. The centralization as "controlled by the community" or "controlled by the majority" is still bad.

Some people think that democratic open procedures make the elected group somewhat decentralized. It is wrong. Think about it, with all the democratic institutions (elections, parties, openness, freedom of speech, and so on), we still have totally centralized central banks.

Getting back to crypto. If I mine bitcoins I get my miner reward even if no one else likes it. In fact, everyone is against me getting the tokens. This is what the decentralization is. This is how we push back the collectivism.

It is very different in some other blockchains. To get a reward I should be supported by others. I should not just reveal myself but also acting to please them. How is this different from electing a member of parliament? Not much. And it will end up with the same groups of interests that are manipulating the crowd and controlling everything.