Mitigation 1: Campaigns run by bots. Mitigation 2: Sign up for campaigns outside of forum. While they keep figuring out ways to mitigate this, we've lost a lot of time and effectively accomplished only minor results.
Countermeasure 1: reroute links in their signatures somewhere else? That will for sure stop playing whack-a-manager with alts.Most campaigns don't want users with red trust. A red trust label "spammer" from a Moderator could make the account worthless to farmers. It may also be possible to disable the signature for any account that has red trust on a certain DT level.
Ever hear of the saying "A few bad apples ruin the bunch"? That is exactly what is happening here. If those users who are not shit posters actually post with decent quality, they should have absolutely no problem finding another signature campaign willing to both pay them more and accept them into the campaign.
Yesterday I saw a good post from someone with a Yobit-signature. I checked his post history, and it really felt like such a waste to see him in that campaign. The image of the signature really makes his posts look bad, while they're not.Quote
It is entirely bitmixer.io's fault for paying the shit posters and not enforcing their own anti-spam rule. It is entirely their fault for enabling those shit posters/account farmers to continue to post and be paid for it. They are encouraging shit posting by continuing to pay for it; and that is entirely their fault.
Clearly, they earn from it. And as long as there are no repercussions for them, they keep earning.Devil's advocate: why do more work to earn less?
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Many are, but many still continue to shit post after their bans or they come back with alts to complain about their bans. However there is enough evidence to suggest that many of those spammers spam because they are being paid by poorly managed campaigns. Thus instead of treating the symptoms of the problem (i.e. the spammers), we need to treat the source (i.e. the campaigns themselves and the people who run them).
Go for it 
Usually I read topics filled with complaints about spam, I might have missed some topics, but this is the first time I read about plans to take action against it.