Crypto IS higher on the radar because it's easier to pull off a fraud and send it through a bitcoin mixer. That's simply proven by criminals preferring crypto.
Bank money mules are a lot harder to accomplish if you're not a criminal organisation. Additionally, the money is more easily recovered through banks and banks should return your money from fraud in many cases: Eg. https://www.citizensadvice.org.uk/debt-and-money/banking/ban...