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.
volume ? why you need to consider these things if you want to launder a money ? volume is not important for illegal activities imo but your right that privacy coins are better to use for doing illegal deeds as they are not traceable but when it comes popularity , bitcoin is popular compare to other coins and this might be the reason on why criminals use bitcoin the most but money laundering does also occur offline so its not really a big deal to me when i heard a news like this .