Ethereum blocks are produced and verified by a set of over 600,000 network participants called validators. Although most validators are managed by a few large entities, the number of individual entities is still estimated to be in the thousands, leaving the network in the hands of a widespread group of operators.
These validators are geographically and jurisdictionally distributed, giving the Ethereum platform higher resilience against targeted attacks by an individual, enterprise, regulator, or even state-level actor. The distribution of the network participants mitigates the risks of having a single point of failure, allowing any network participant to go offline — either voluntarily or involuntarily — without disrupting system operations.
With the protocol rules enforcing a Proof-of-Stake consensus methodology to ensure all network participants are on the same page, Ethereum can continue moving the chain forward even if up to 33% of validators are offline or act maliciously. This level of fault tolerance is what enables the network to remain functional, even under adverse conditions, supporting Ethereum's vision of an open, neutral and resilient computing platform.