I think bounty hunters can get extra income, but it's not recommended to be the main job because many projects fail or scam.
I can agree with that thays why joining in some of ICO is your own risk you have to be smart on looking for some ICO or project nowadays i do also believe that many scam projects are spreading but then again joining in some bounty campaign is your own risk it is better to risk than to do nothing i myself believe in cryptocurrency