I think we are not completely anonymous to bitcoin, maybe somehow people will find us (via IP address or trading wallet).
In case people sell bitcoin and cash it out, I think the government will immediately recognize you.
^ Definitely right, because bitcoin was created not for hiding your personality as a payment. The intention of the creator is to become a worldwide digital currency that probably uses in any form of payment method online. It can be tracked your identity but I had a few questions bother in my mind.
Why those crypto exchanges hacked last year did not recover the bitcoin had been stolen, is their lack of information or just an inside job.
Nevertheless, I can say that probably 25% you can hide as a anonymously but the rest, it can be trackable.