Digital currency is to change the world, many of which were positive, to a certain extent, they pose a containment of the government, gave the people an alternative, but that doesn't mean they don't need to be regulated.
One of the core reason is: anonymous, do not track, not regulated digital currency will make form a closed loop technology crime, money laundering and terrorist, and disappear from unsolved bits, bytes, while the impact damage with each person in this world.
If every penny of extortion is tracked, is there enough motivation and courage to launch a WannaCry to attack the world?
No doubt that bitcoin is much better option to have as a payment and earnings asset in our life than what the benefit we have with the fiat currency , but still here we need to have better rules and regulations that can regalate digital money fully and can intergate it with the tax system , Because here most of the people are making transaction from country to country without paying tax , but here it is a mendetory rule by the government of the reserve bank of any country that we need to pay tax if we want transfer money form.our country to another country , so to make a rule regarding this will result into cryptocurrency as a legal way of payment .
And also in cryptocurrency we need to have rules where people can believe in cryptocurrency easily that can make people trust in cryptocurrency like assets and can trade easily Because it is like stock market where lots of fluctuations are going on and we trade them like cryptocurrency .
And also few people are using Bitcoin like cryptocurrency for the money laundering ( which is fully illegal ) , so if better rules and regulations will be made by the government then it will be more better to stop illegal activities to use cryptocurrency .