As we know that the advantage of cryptocurrencies is that it is decentralized, meaning that it is not centralized or there is no third party intervention. but if cryptocurrencies have been legalized by a government, it is clear that regulations will be enforced, although they cannot change the nature of decentralization itself but other regulations such as being taxed may be applied.
The main factor that will be explored by the government is the tax problem. because this is state revenue to support the development of a nation. somehow the form later, of course this regulation must benefit the state, and of course a clear regulation is needed. it seems that this will be easier, because the government can see every transaction even if it is a small amount