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.
Not all altcoins either. There are some privacy coins that are anonymous. zcash, monero, electroneum. To name a few.
Of course as soon as you try to exchange it to fiat via a centralized exchange all anonymity is lost.