Everytime when I am choosing a bounty campaign I do a deep research about the project, team, future perspective and also do a calculation of possible rewards. Then I will choose the best one. 
it is true that we must always do research before participating in prizes so as not to get caught up in fraud even though we sometimes believe it is good. I hope that the fraudsters will be destroyed and new projects will continue to emerge because if there is no development, the hunter will be harmed.