Like every crime (anything the government don't want you to do), you'll only get away as long as you don't do a stupid mistake that can tie you to the crime. Encrypting every file on someones computer and demand a ransom is a pretty serious crime, if you ever plan to do that, make sure that you know how to stay anonymous.
You can't just receive a crypto payment and then think you're 100% safe from any consequence, that's not how crypto works. But if used correctly, yes then you can be fully anonymous.
So what, it's only untraceable as long as you never spend it?
Like every crime (anything the government don't want you to do), you'll only get away as long as you don't do a stupid mistake that can tie you to the crime. Encrypting every file on someones computer and demand a ransom is a pretty serious crime, if you ever plan to do that, make sure that you know how to stay anonymous.
You can't just receive a crypto payment and then think you're 100% safe from any consequence, that's not how crypto works. But if used correctly, yes then you can be fully anonymous.