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.
You can lessen to encounter a getting scam but you cannot avoid it especially here in cryptocurrency world because its made of technology which means some people can create new coin and do anything to attract people to invest to it. So the best thingntondonis extra careful and analyze the it. And be prepared for what ever outcomes and keep going because surely you will find the best one.