The idea of one city on Mars is wrong, indeed it is dystopian, because the city government would have even more control over you than on Earth.

The most attractive aspect of Mars is the ability to "avoid Imperial entanglements" to start society again, very small with no government and only a very limited number of rules.

It is entirely possible for a small group of like-minded people (eg Hiveans) to start their own colony and be self sufficient in the basics: energy, air, water, food, shelter and trade with other communities and Earth for specialised goods.
Cryptocurrencies and decentralised blockchains like Hive provide building blocks.

Cheap and plentiful energy from Solar Power provides self-sufficiency.