when they regulate exchanges and close those that fail to do it or have been laundering money, this should not be confused with banning bitcoin. and closing exchanges in some cases is perfectly natural.
even banning ICOs is perfectly understandable since they are not legal way of raising money and there is no product, no company,... to deserve this money raised.
but when they ban bitcoin (which happens to be in 3 or 4 countries and China and Korea and Russia are not one of them despite what the news keeps saying) things are very different. it is not normal and it has nothing to do with that warning I talked about. it is the panic that the corrupted governments have regarding their loss of control to fuck up the economy and fill their own pockets.
Do you mean Venezuela here? Which are these 3-4 countries you speak of? Their governments must be downright incompetent, and Bitcoin may be the last straw to break the proverbial camel's back there. People in these countries don't want to have anything to do with them, so they abandon national currencies in favor of crypto and major fiat currencies such as the US dollar like it happened in Zimbabwe a few years ago.
you can see the full list here: https://en.wikipedia.org/wiki/Legality_of_bitcoin_by_country_or_territory
I had Bangladesh, Bolivia, and Zimbabwe in mind. and despite bitcoin not being illegal in India, there are lots of money issues there and they are tightening their grip around bitcoin but people are investing more and more in it as they make it tighter!!!