i don't think that the criminals are idiotic enough to
only use mixers when it comes to laundering their funding. even if you have banned all of the mixing services, there are so many other methods on processing their illegal funding, including going through a possible pari-mutuel casino betting (could be risky, but as long as you find a safe-enough method for it). so let alone KYC mixing - they can often fake their identities in order to get their "legal" access.
financial freedom is a bitcoin's spirit, mixing is one of the most important method on exercising it. understandable that this website isn't a grey zone, but if mixers are to be banned for this reason, expect a new and more complex method replacing it.
Also I should point out, it should not be ban-worthy to link to a closed mixer's ANN thread. Or actually to any post in the ANN thread that is not advertising to use the mixer.
agreed, because they are no longer on service.