Bitcoin is pseudo- anonymous. It is not anonymous.
That's exactly what I tried to write in my article. By the way, not only bitcoin, But all altcoins have such essence. I wish I had thought otherwise.
You are right about bitcoin, but altcoins can actually be different. For example, Byteball has a net of private transactions with blackbytes. There are also other cryptocurrencies like Monero and Zchash, as xtraelv pointed out. However, I came through some articles that were doubting the real anonymity and maintained that with good work it would be possible to tract down the coins to some address. But it's more like there are people who say that Tor is not safe ans cannot provide pure anonymity, so I am not sure those articles made sense.