They can still make money from it. They don't have to ban it and just impose a regulatory tax that every profit gained through crypto is taxable and has to be declared as income.
In some countries, they're doing this. Instead of putting a ban to crypto related income, they're simply giving their people freedom to get along with another source of income through crypto trading.
but for my country this is still complicated to do, tracking is required on their personal crypto wallet and it is still not possible. the use of regulatory tax is only imposed on exchanges in that country, not for individuals or individuals. Some crypto regulations in developing countries allow crypto to be used only as a commodity asset no more than that.
Crypto is becoming very popular and many are already aware of it. Several agencies have also started to enter crypto, large companies and others. Other income through crypto trading provides an opportunity for them to get more profit but still with a high risk and become their own responsibility.