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That’s not how it works.

The people who hold the majority of the stake are the majority, not the minority.

There is a difference (with the introduction of slashing and user activated soft forks) in 51% attacks that revert finalized blocks. In PoW this type of attack would become cheaper as it persists, in PoS we have some defense that keeps making this attack expensive.

On top of that the costs of attack are much greater in PoS than PoW, making these attacks much harder to begin with.

https://vitalik.ca/general/2020/11/06/pos2020.html

Vitalik and company have zero history in the proof of stake game, and what little security history they do have is pretty much awful. So I'm not too worried about what they have to say about things. If it's not something he copied from Tezos or ADA, I wouldn't consider it relevant to the discussion at all.

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