The announcement from ZKSync regarding the hacking incident boldly states, 'Matter Labs, which is currently ZKsync Era chain’s sole sequencer,' meaning that a chain claiming to be one of the 'Four Kings of L2,' ZKSync, actually has only one sequencer, which is its own. It's hard to imagine what it means for a public chain to have only one node.

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This is not an isolated case; almost all L2 nodes are held in their own hands. Sometimes I really feel that the crypto industry has double standards. They constantly criticize BSC and Solana for their data center downtimes, while at least they have dozens or even hundreds of nodes. Yet they keep praising Ethereum for its decentralization with tens of thousands of nodes, while a bunch of completely 100% centralized L2s with only one node have sprouted up. It's too distorted.