no one knows exactly where the scam and what is not, except maybe he has the 6th sense may be hehe, the point back to dirikita each, we do something we really understand and we know. my advice is more careful, because it all depends what we do as well. yes so lah I never experienced it because I myself was not careful.
I would slightly modify this advice. Assume that any offer is a scam by default. Make them persuade you otherwise. Think about worst case scenario, and make a decision only knowing that you will be ok if the worst thing will happen.