It is impossible to avoid fraud in such a market. If you actively invest in projects or participate in bounty campaigns then you will probably sooner or later run into a fraudulent project that will deceive you. You have to be mentally prepared for that.
In all bounty campaigns, I do not see many of the tokens of those campaigns rising after being on the exchange except Lympo. Lympo is one of the most potent projects they have advertised by the most famous basketball team in the US