Since taking on campaign work is also based on subjective considerations, it's your right to deal with any company. Assassins get paid too, some not even worth it. No matter the dirty company, sometimes someone has to take it even if they have to sacrifice their own reputation because of financial pressure. However, it means being involved in the wickedness and cannot be justified.
Yes, some of the participants in the previous 1xbit campaign were members with neutral reputation (default) but due to financial pressure reasons they were willing to sell their reputation for a few dollars. Now neither of them can be trusted because the trust feedback they have currently makes most of the other users hesitant when it comes to dealing with money.
Now I confirm you, someone promoting a scam cannot be justified especially if they realize that what they are promoting is a scam site or project. Negative trust will be a consequence for those who do it.