Crypto-economic systems are all about creating game theory systems of incentives. You supply work to the network, the value of the network increases, you receive tokens and the value of your tokens increases. Today we use the innocuous word 'incentive'. In the future when the economy has been tokenized, we will see it as just another system of control.
Nobody is forcing you to add value to society, it's just in your best interest to earn more Social Credit Token (SCT). What? You don't have enough SCT to apply for the best schools; see the good doctors; drive in the fast lane? Well, it's a free market. Everyone has an equal opportunity to earn more SCT, don't they? You should have put in the work necessary earlier in your life. You have only yourself to blame if you are not contributing to society as much as everyone else.
Governments do not need to create their own digital currency. But they will have their own token which will serve the same purpose of control as fiat money does today.