Snowden Leak Suggests NSA Is Extensively Tracking Bitcoin Users :The U.S. National Security Agency (NSA) has been reportedly monitoring the bitcoin blockchain with an eye on identifying users on the distributed network.
Link for details news:https://www.coindesk.com/nsa-reportedly-eyes-to-scrap-bitcoins-anonymity/
If the bitcoin lost anonymity, so the currency will happen very big change, some people they may give up the bitcoin , because lost the confidentiality, our privacy transaction privacy will know by the government, which for some like bitcoin for currency anonymity person is very terrible, they will give up the bitcoin