Hello, you're absolutely right, but it is sung that the pirates appear, they always do and they might be already planting seeds in the system.
Is there anything more magnetic and attractive to an offender that a system like Bitcoin? The demanding design Bitcoin with its characteristics of "difficulty" and "halving" is the most attractive and powerful force in the universe for a criminal. Let me explain with another question: to provide energy + hardware + tracking + hours of valuable time to decrypt a block BTC, if using only a fraction of the above I can rob a major system? Leaving thousands of users without coins.
Your answer is inside the mind of a criminal.