This is just what I can say, Study carefully the crypto currency and research every ICO Campaign to avoid being victimized by scammers. We should learn from our mistakes because that is the key to our success!
Many bounties and ICOs are boldly scam today.
And by just staying in this section, you'll see different stories on how they've come up with those scam campaigns. Learn from the experience of others and get yourself a favor of doing research before joining any campaign that you think suits your standards.