Top mixer is paying 5 years now lots of thousands of dollars worth of bitcoin every month to be appeared in every thread of this forum. If that isn't aggressive advertising, I really don't know what it is.
I wouldn't call it aggressive, but just well-thought-out and long-term sustainable advertising through this forum, in such a way that they found a winning formula that consists of several dozen participants and a price that CM can afford to pay every week/month. Most of the other mixers and sig campaigns have a different approach, which consists of campaigns that don't last long enough, not to mention that they don't have enough top posters to bring them the desired results.
Also, the rule
"you must post at least xx posts per week" does not contribute to anything else, but only more spam - which is also part of a bad strategy that many apply.