All money transactions can be track, so earlier or sooner, regulator or fiscal authority will know all about you...
OK. So, how does the regulator in your country know that you are getting money from the bit?
You receive money from the ATM, then banks request information if you have this money on the card. The card issuer responds that everything is in order. Only if the bank considers this transaction suspicious, it can request more information.
You are right, but they always can get this information. And banks don't loyally to cryptocurrencies, so do government.