Write in local forums is considered spammers 
For me, there are two types of spammers: 1) Those that spam with low quality posts in English (either repetitive content, posting in burst and such)
2) Abusing/breaking the rules since the counting and payment is automatic.
For Bitmixer campaign both go on the blacklist. Different campaigns would be treated differently obviously.
I agree that some campaign managers (not necessarily in SMAS, not gonna name them) tend to marks a post as good without even trying to find if it has been said before in one way or another.
I'm pretty sure that this is not the case with SMAS (you could argue that it is for Bitmixer since counting is automatic). If these *other* managers were participating in a group project like this, that would severely cut down spam.