The number 1 choice of criminals is still and will always be fiat. It doesn't require any sophisticated tools or knowledge and is accepted everywhere.
The 'crypto is for criminals' narrative has been debunked so many times, but if you still need convincing just look how crime infested traditional banking is in comparison: https://youtu.be/f8iPIV9cBAs
The 'crypto is for criminals' narrative has been debunked so many times, but if you still need convincing just look how crime infested traditional banking is in comparison: https://youtu.be/f8iPIV9cBAs