The first Trillion Dollar Security (1TS) report warns that centralisation of large stakes and vulnerabilities in Ethereum’s social layer and decentralised governance pose long-term security risks, enabling potential collusion and social governance capture

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Centralization of large amounts of stake can pose risks to Ethereum as a whole if the entities controlling that stake decide to collude. This economic centralization creates the potential for social governance capture.
On the governance side, the report warned that Ethereum’s social layer, its network of developers, institutions, and cultural norms, is itself a potential vector for attack.