Oh I totally get that, but...
I reasonably believe in good-faith that it hasn't been categorically proven to be illegal. The reasons for this may seem obvious to many, but just it's not for anybody else then I'll give at least one persuasive argument. Illicit activity happens through legitimate financial transactions. For example, if I trade somebody a pizza for $10, how am I to know that $10 wasn't used in a criminal activity, ever, in the total existence of those note's circulation? And further, by using cash at all, as a concept insofar that cash is not rigorously tracked while in circulation, that the whole cash money system is illegal... Cash based economies to a great extent protect the privacy of participants. Those machines that make change, I suppose that's money laundering, and I would suppose they are laundering money for someone, but also... they be making legitimate 20x quarters from a $5 bill in a coin operated business setting. The quarter change making machine is the physical analog of a crypto mixer, but it's perhaps a bad example. Because making change for the sake of privacy is an unlikely activity, albeit a reasonable legitimate (if you ask me) activity.
I honestly would love to see more court precedence set on some of these so-called "structuring" laws where somebody intentionally "structure" or "laundered" money for the honest-to-goodness sake of legitimate privacy, or even for somehow being a form of free speech, something like that... to strike away some of these absurd regulatory powers before a panel of jurors.