A friend of mine got scammed joining a campaign here and it has been like 2 month now and still got no word from the said campaign. And sad to say we cant do anything about it if they don't give out the reward. What he did is that he just let it go and joined another worthy campaign which paid him after the ICO ended.
It's sad to know that your friend got scammed upon joining a campaign here, what saddens me most is that the victim can't do anything about but to just let it go. Though I think the manager of that campaign got lots of negative trust after doing such thing which he/she truly deserves. We really don't know how it feels to be scammed unless we experienced it but I guess it is really common to experienced in this kind of community.