Recently, I saw the on-chain front-running/ sandwich attack methods again, basically the unfair ordering of MEV. The first to be affected are actually ordinary people's slippage: you think you're executing at your chosen price, but someone front-runs you, and the difference becomes your tuition fee. What's even more frustrating is that it also lowers everyone's "trust threshold." When cross-chain bridge thefts happen, or oracles report abnormal prices, the community immediately adopts a unified stance: wait for confirmation, don't rush to act.