You are right, once you are a cybercriminal, you will be always a cyber-criminal. Whatever the condition, cybercriminals always attack very simply. In my country, the criminal is caught and arrested after being a cybercriminal for several years previously. And he was arrested after doing that criminal in some years. So, does it mean that it is possible for the criminals to be caught and also arrested?

I believe that the way they use and transfer the BTC will never use their primary identification because it will sometimes need the account identification. It means that as long as they are use the centralized exchange, they may be revelaed.