By design, they enshrine the rights of the individual participant to freely interact in a free market, by preventing the majority from creating any rules to limit access to the platform. So they don't have the same need to adapt as an interventionist government, that imposes itself on the economy through majority dictate, does.

In the case of Ethereum, the Turing Completeness also makes it so that each contract is like a government in and of itself, which any party is free to design to meet their own preferences.