In fact, if you are very careful, it is almost impossible to understand that you own bitcoins. But it only works for someone who regularly takes all the necessary precautions - uses bitcoin mixers and stuff. Those who talk about their crypto-currency assets to their friends - risk too much.
This. Bitcoin gives you the possibility of being virtually untraceable, with that, even where such things are prohibited I strong disbelieve the government have the sufficient power to keep the population in check or in track, unless you live in North Korea... That's another dimension.