There are a lot of way for money laundering but bitcoin is the best way among all the way of money laundering and for becoming favorite of bitcoin is one of the main reason is money laundering.
I can't agree with that, there's way better than bitcoin and that's the privacy coins, when it comes to volume, they also have that, so definitely if the purpose to launder money, they have to be find ways where they will not easily be trace, and definitely it's not bitcoin.