One question I would like to ask is if mixer campaigns are banned from this bitcoin talk forum will mixers stop? Of course they will try to advertise in other places. If the mixer doesn't stop, it might be better to let the campaign go on this forum.
Definitely, mixers will go to some other place to advertise themselves, and the reason behind banning mixer is that bitcointalk or it's users does not get into trouble for promoting them.
I would prefer to allow them. I don't view using them as unethical, and I don't care about reputation. But this kind of thing is far from the core mission of bitcointalk.org, and the costs far outweigh the benefits.
It wouldn't be illegal to continue allowing mixers here. That's why we're able to offer a 1-month grace period. But allowing them has become too risky/problematic, and it's only going to get worse. Imagine 5% of all active forum users being sanctioned due to being paid directly by mixers, or all participants in a big signature campaign being targets of a search warrant, or our service providers suddenly banning us due to being "associated" with mixers, etc. I think that the crypto community is near the start of a multi-year squeezing campaign against mixers; similar to the cannabis industry in the US, or Operation Choke Point, or what happened with Backpage, or the deplatforming of Parler.