You can easily establish the connection from a bank account to a person. A connection from a crypto wallet to a person is extremely difficult.
Money laundering with crypto is also much easier (and cheaper usually).
It is possible to make your transactions extremely difficult to trace, but you really, really, REALLY have to know what you're doing.
Law enforcement loves that people think it's easy and cheap to launder money with crypto, though. It's made it vastly easier for them to catch those people!