Let's say I buy 0.1 BTC using Bisq. Okay, so the person I bought it from will know my name since I have to give it up to make the international bank transaction. And I will know their name because that's how Bisq works and apparently has to work. Alright.
Us two strangers know each others' identities.
So, does this mean that the person I bought the 0.1 BTC from now can track exactly how I spend it? How? Isn't the truth that, at best, they can see when I spend it (if ever) and which "receive address" received it? Which tells them exactly nothing whatsoever?
Ever since I first heard about Bitcoin, over a decade ago, I've been trying to get clear answers on the most fundamental questions, but never receive anything but assumptions/guesses or such technical and in-depth explanations that they might as well be made up and I couldn't tell the difference between that and the truth.
The most common "explanation" is to vaguely state that "it's completely trackable and 100% non-anonymous", but that seems to be utter nonsense to me. It actually seems to be very anonymous. The person I bought the 0.1 BTC from cannot possibly know if I'm selling it, paying for something, or just moving it to another wallet of mine. They have no clue. It's just a gibberish string of computer-generated characters -- not a full name and address and photo id in a neat little digital package.
I seriously believe that only a handful of people in the world truly understand how Bitcoin works on any deeper level, and that all the others are just pretending in order to not be seen as "stupid". Like the old tale of the naked emperor.