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 ?
I also have to admit that now the total number of scammers and unsuccessful projects that do not have any prospects for further development is quite large in the bounty market. Many ICOs face failure. But I believe that approximately 25% of bounty can bring success and income to their members.