I think I've come across a thread like this previously, can't tell exactly who started the previous thread but I do know that this discovery of the op is nothing new, unfortunately, (like examplens said), it's always 1xbit campaign participants who are culprits to this kind of posting habits, there is nothing really we can do, their accounts are already tagged, the campaign manager is probably aware of this posting habit too, this posting, I also don't know if this can be classified as post busting, but even if it is, does it really matter? Looking at the type of accounts involved.
I think it's important to pay attention especially if we care about spammers. I think spam should be reported to moderators regardless of who did it, so we don't really have to ignore it despite the fact that those participants no longer care about their reputation.
The more spam posts that are removed the better for the forum regardless of the participant of any campaign. So there's no reason to let 1xbit posters post spam, edit them any time for his sneaky purposes to get paid on campaigns without reporting it to the moderator. Although the campaign operator does not care, but the contribution of other users to control spammers is highly expected.