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It's not a sybil attack at all... Just witnesses using fancy words and the crowd cheering for them.

Yeah. I thought sybil just meant lots of fake accounts or an attack vector along those lines.

It involved pseudonymous identities representing 20 individual witnesses when in actuality they were all controlled by one person. That, to me, is clearly and irrefutably a Sybil attack. And yes, it was definitely stake-based as that's how DPoS works.