Bitcoin does not offer any privacy. You create a new, empty wallet address? Yes it is anonymous. Do you get some coins from your friend? Now you are linked with your friend and whoever your friend is in turn linked to. Do you buy some coins from an exchange? Now you are linked with that exchange (which in most cases collects your personal information). Do you buy something from overstock? Now you are linked with that store. And these links are permanent. You could create another wallet and send your coins there, but all you can manage is to just make another link to all of the above.
All this is being done:
https://www.elliptic.co/financial-institutions/Also for those who still don't want to accept it, watch this from Greg Maxwell himself:
https://www.youtube.com/watch?v=LHPYNZ8i1cURegarding another 100% private cryptocurrency, in the end yes it will be banned from the government(s) (see China for example). The coin itself cannot be banned, but the exchanges can. And that currency will sooner or later be used for illegal purposes (Alphabay etc.)
I am going to watch a video, but it is kind of long so it will take some time, but I still think that it offers good privacy. Sure it links you with your identity, but it also links you with plenty of other identities that don't need to have anything to do with you. You can always send your coins to a new address and no one can really know if it is still you. And when you buy it in person from someone, even if he is your friend, there isn't a reliable way to know that those coins belonged or maybe even still belonged to your friend in the first place. It is very hard to find an owner of a address, go ahead, try it yourself. There are mixers as well and Bitcoins can often travel through person to person trades or a bunch of in-wallet transactions.
I just claim that it isn't no privacy, it isn't that easy at all. It is quite the effort if someone is careful. And it is recommended to use a different address for every payment. There is nothing that is 100%, if anyone is really motivated they will always get you, that is the reality, but it can be very very hard with very little effort on the other user's part.
It is more then 150GB of simple transactions, that is a lot of analysis to do. You are trying to track a fish in an forever moving ocean.