That's one of the benefits that the government will get if crypto will be adopted to a country, there's also a benefit to the citizens.
They will have another source to make money and that is through crypto's unlike other countries who banned it, you don't have any chance to make money with crypto or trade with it so that's the counterpart of letting a government support crypto.
It is true that crypto can provide many solutions for a country and its citizens if adopted to be used as a payment method other than fiat currency. In addition, blockchain technology used crypto can work for various sectors, especially processing and data storage that can be utilized by the government of a country to run various services that have so many problems related to it.
Yes, blockchain and crypto's are separated if the government will take advantage of it and many sectors will be able to upgrade their systems in terms of data processing and storage.
But taxation is different from technology adaptation