I can say 100% that 60% of all bounty is a Scam. The reward for them is either given and the tokens will lie on your wallet forever or do not give at all. Then what's the point of doing this ?
Not 60% i would rather give out 80% of them are total scam. Not directly to be showed but basing on the after results you would really able to identify out that most projects doesnt really have any sense. If you are asking on whats the point on doing this? then we do know this is one of the way on making profits thru this kind of investment and risk factor cant really be avoided on these scenarios and therefore if you dont like to lose up money or end up on holding a shitcoin then its your choice not to invest or risk at all.
Maybe not 60% or 80%, but more than 95% of bouties like this. In my opinion, there are some rewards, although the final payment is for you, but the token you get is difficult to trade, and it becomes no worth in just a few days，this is almost no difference from scam.