To enlighten you up, The Government can ban Bitcoin or any other cryptocurrencies. The Government can block any websites that are related to cryptocurrency or Digital currency and etc. But Government has its limitation, It can't shut the internet down without any legal grounds (Depends if the leader of the Country has declared let say martial law or do social media blackout, including cutting off internet access) there are VPNs or Proxy sites in which one can use to continue it's crypto related activities.
Though it wouldn't affect the industry since Indonesia is a small market plus they can still engage in such activities if they only knew how to use VPNs. The big markets are still up and most likely will just compensate for that loss (not really), The players of the industry this year will most likely increase. Bitcoin already had built a good foundation before 2017 end and this year, there is a higher possibility that Bitcoin could make another history.