That's right, a crypto mixer that affords true privacy (except relative to the mixer itself) w/o additional controls (e.g., transaction limits comparable to practical limits on cash transactions) is definitely a money laundering enabling capability.
Whether one can conclude that the people running the crypto mixer are engaging in criminal activity will depend on the text of the relevant statutes, though I'm pretty sure those will be fairly airtight.
Whether one can conclude that the people running the crypto mixer are engaging in criminal activity will depend on the text of the relevant statutes, though I'm pretty sure those will be fairly airtight.