Countries with good economic experts have tried to formulate tax policy that will cover digital currencies e.g France but this policy have not perform well when it comes to cryptocurrency due to it decentralized nature and unstable market price which makes impossible for cryptocurrency users to be taxed effectively. Before any country can be able to receive tax from crypto it has to first of all regulate the cryptocurrency market and regulations also is near impossible.
Some gross overestimations here. Countries may have good economic experts, but these are seldom the same ones formulating tax policies. How a country formulates any of their economic and fiscal policies generally has to do with leadership and type of government. Which is why you get wildly differing tax policies for Bitcoin all across the world - if at all they exist.
Tax policies in these cases also seldom react to Bitcoin. Instead, how Bitcoin is categorised will determine how it is taxed. In cases where it can be categorised as an untaxable personal property, for example, sure, it can be a means to optimise tax. Bear in mind, tax optimisation or "avoidance" is barely legal, definitely frowned upon, and with time and legislation on its way, will soon become completely illegal.