It's anonymous. But the problem is for example someone try to purchase drugs using bitcoin. This become a new era of transaction without being notice.
Why is buying drugs a problem? I think that's one of its benefits. If people want to buy drugs let them. The law should go after real criminals not criminals they themselves have created from their draconian policies.
it is both a benefit and a problem at the same time!
it is true that you can anonymously buy drugs and other illegal substances with bitcoin, and stay away from the law and getting caught.
but at the same time this is an illegal activity that is being done by bitcoin, after a while if this grows, bitcoin will be advertised by the media as money for criminals.
this is bad and will cause many people to stay away from bitcoin as a result. even countries might ban using bitcoin because of it.