For some, the income we receive from these campaigns is a big portion (0.3BTC isn't exactly a small amount). I am waiting until I get paid then will decide the best course of action.
Its an interesting dilemma. If people are going to neg rep you then should do that for all those who are sporting the cryptcominer or gawminer signatures. I suggest you add a banner to your posts disclaiming the signature or directing people to the relevant thread.
If its proven to some reasonable degree that they scammed (I am sure they did), then the escrow holders should take the call and divide up the money, or settle it with some lower pay.