I absolutely agree with you, but 316 million is way beyond what banks are really capable of. Given the current low marketcap, there is a case in which a group of banks is accused of an attempt to launder more than the total crypto market capitalization! It sounds unbelievable, I know, but this is not some low quality news, the forbes wrote about it a while ago:
https://www.forbes.com/sites/francescoppola/2018/09/30/the-banks-that-helped-danske-bank-estonia-launder-russian-money/. These people got caught, but how many more did everything successfully? Blockchain allows to view transactions and the community is very diversified with no key holders of bitcoin being around. Banks are watching others not to launder money but the problem is that nobody's watching banks and preventing such schemes.
Imagine over 200 $ billion money laundering just by one bank, and this is not bank form some corrupt country since this is about Denmark. Or what about
HSBC, one of the world largest bank which was the main bank for money laundering used by Columbian and Mexican drug cartels and financing of terrorism for years -and fact that the highest officials of the UK are deeply involved with this bank tells us on what level is money laundering in the world.
The estimated amount of money laundered globally in one year is 2 - 5% of global GDP, or $800 billion - $2 trillion in current US dollars. Though the margin between those figures is huge, even the lower estimate underlines the seriousness of the problem governments have pledged to address.
To say that
BTC is used for money laundering sounds like a bad joke,
trillions of $ go dark with the services provided by banks.