My understanding is that blockchains are designed to ensure that it would be economically irrational to attempt to expend resources competing with the blockchain, creating create a stable equilibrium in which rational participants cooperate.<p>It might not be worth a scammer&#x27;s money to buy enough computing power to double-spend, but that doesn&#x27;t mean a government mightn&#x27;t find it worthwhile to spend money to tamper with or destroy something it perceives as a threat.