Consensus on smart contract?

why do we need consensus on a smart contract?
i dont understand

hi @Gerben0000 its like in a bitcoin network you need the miners to validate a block of transactions(eg: txs of assets, smart contract operation…) … no one will do it without consensus…

Each operation on the ethereum network has a cost, expressed in gas, a measure of the computational use of the unit. Gas price and limit are correlated to costs of launch a dApps or DAO…

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