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 read studies that said that in 2018, the share of fraudsters among the bounty programs was really about 80%. Unfortunately, this is an objective reality that must be taken into account. Personally, I consider bounty for myself as an additional income - periodically it is possible to find profitable options.