To go around economic sanctions imposed to some countries, for example the United States' sanctions on Iran, North Korea, China, or Venezuela.
There are a couple of things that governments would not like about bitcoin.
- The Trust that it has value.
- Imagine FIAT currency, they have value because the government says they have value
- They want it to be backed with tangible assets
- They want control over the currency (which is not possible for Bitcoin)
- They can't control the maximum supply
- Crime Concerns (with all the media and news surrounding it, I don't know if they will trust it)
I think there are more to be discussed, but that's just came from the top of my head. I believe they have other concerns rather than this one. Unless the Leader of that country believes in the currency, that would be a different story all over.
But censorship-resistance is Bitcoin's value proposition, it can be a powerful tool for a country/nation/government.