Although everyone has answered. But I also think so, no matter how much Bitcoin is traced, if you use a mixer, it can no longer be traced. I was once a victim of Ransomware. All the files on my computer were encrypted. So they asked me to send this money to their Bitcoin wallet to recover my files. Of course, I didn't know much about Bitcoin at that time. And I had to delete all the files and install a new operating system. So it is clear from now on that criminals choose crypto more than fiat currency in terms of crime.