Validators in proof-of-stake systems face a tension between short-term control over which transactions to include and long-term economic survival. Protocol designers build in safeguards so that a rational validator loses more by choosing to censor than by following the block-production rules. These safeguards include on-chain slashing and penalties, randomized proposer selection that reduces repeated control, economic opportunity costs from missed fees and MEV, and off-chain reputational and legal pressures that can make censorship unattractive.
Economic penalties and protocol rules
Slashing is a core deterrent: misbehavior that breaks protocol safety or liveness can cost a validator a portion of its staked funds. Jae Kwon of All in Bits describes how Tendermint uses slashing for equivocation and prolonged downtime to align incentives with honest participation. Missing fee income and forgoing MEV extraction are additional economic disincentives; as Vitalik Buterin of the Ethereum Foundation has argued, mechanisms like proposer-builder separation and MEV-aware designs distribute revenue opportunities so that excluding transactions is often economically inferior to including them.
Detection, randomness, and external costs
Censorship is easier to attempt when a small set of validators repeatedly control proposership. Randomized proposer selection and large validator sets make sustained, undetected censorship costly and unlikely. Andrew Miller of the University of Illinois Urbana-Champaign and other researchers emphasize incentive compatibility: when protocol rewards and punishments are calibrated properly, rational actors maximize return by participating honestly. Beyond protocol math, validators risk reputational damage and legal exposure if they comply with government censorship demands; Emin Gün Sirer of Cornell University has commented on how centralization of staking amplifies those risks and the community responses they provoke.
Relevance, causes, and consequences
Censorship incentives arise from concentrated stake, regulatory pressure in particular territories, or collusive strategies to extract MEV. If unchecked, censorship erodes trust, reduces on-chain economic activity, and can push users to alternative chains or layer-two solutions. Cultural norms among operators—commitments to censorship resistance versus compliance—shape responses; validators in jurisdictions with strict surveillance laws may face hard choices between legal compliance and protocol norms. Environmental benefits of proof-of-stake reduce one class of operational constraints, but they do not eliminate political or economic incentives to censor.
When economic disincentives, transparent detection, and protocol design converge, validators are more likely to include transactions than to censor them, because the long-term cost of being excluded from consensus outweighs any short-term gain from selective exclusion.