Crypto frauds are hidden through different ways, some are easy to detect but some have perfected the act that it is impossible to suspect fraud until they have executed their plan.
You are right. These days it has become to hard to filter out legit projects from scammy one. I guess it would be much better to stay away from bounty campaigns and only investing into any new coin after a clear suggestion from any crypto experts. Because I cannot afford with any losses just due to being part of any scam projects. So, I act slow in choosing new coins and I believe I am staying secured so far this way.
I guess there should be some simple regulatory authority for approving good projects so that small investors like me may stay find this altcoins industry more profitable and safer for investments.