I'm confused now. Where did the OP get
At least 10 people from [Chipmixer] campaign
There is only one Chipmixer participant in that list (yourself) and even if you count LoyceV's time-travel thread that gets bumped once a week or so, it's still a far cry from "at least 10".
I think he's referring to other people who don't have a renting topic

Some people like Lauda, TMAN or marlboroza (they are advertising for blockchain.com.do)
But I don't understand why he felt so bad about this problem, that guys do not violate any rules

We are free to do everything as long as we do not violate the rules. Why is it a big trouble with OP? Why did he open a topic in the Reputation section?
Currently, there is no such campaigns. But in past (way beffore era of bounties), there was plenty of such campaigns.
For avatars, we can't put a link there, there is no link to the website in one click, that's why the Avatar campaign no longer exists, it doesn't have much effect. I think the same thing happens with Chipmixer, they might argue that avartar doesn't have much advertising effect.