It is difficult to enforce, but a lot of Bitcoin users may face harassment from the government authorities. In India, the situation is getting worse every day. At first, the government was saying that anyone investing in Bitcoin are doing so at their own risk, and the authorities will not be responsible for any losses which they incur. But after the rates increased by 20x this year, they are saying that they will prosecute anyone using Bitcoin for deliberately trying to sabotage the local economy.
With the incident, I'm also worried if the government in my country will enforce the rules that apply in India, even in Indonesia has now drafted a law that regulates ban on use of bitcoin, although currently law hasn't been officially launched but of course it is a serious threat to bitcoin advancement in my country.
this legality issue is important, although the government can not control bitcoin but the policies relating to it are very influential. As in India and Indonesia.
In Indonesia, bitcoin is only prohibited from being used as payment, there is no prohibition on storing bitcoin, but all the risk of loss is not borne by the government. There is a recent news if some banks are starting to adopt a blockchain system, hopefully this can bring a positive impact. Bitcoin users will be very happy if there is legality, but although there is no legality does not matter, the important thing is not banned.