Correct, but advertising and using mixers isn't against the law. In Sinbad's case, the problem was that scammers used it to mix and launder the bitcoin they stole, creating problems for everyone else who had nothing to do with that.
It may not be literally illegal, although no one should have any illusions that it will very likely come to that in the near future. The fact that the authorities allegedly detected some mixers as services through which "dirty money" passes does not mean that this does not happen with all other mixers as well. They are surely already working on some new cases, I just wonder how they choose their priorities - they come to the forum and see which is the most popular mixer, or they put them all in a hat and draw a name
