Icos look for bounty hunters to promote their project through the power of social media.Sometimes, some of these hunters also double as ico investors. But it looks like bounty hunters understand ICOs project and are able to determine very good projects before they invest because of their experiences in different projects.
Depends on the project the bounty hunter is joining. Actually, if they indeed join, they have a good idea of the project as they are learning about it when doing tasks and marketing the project. If the rewards they receive are substantial, bounty hunters, like me, becomes an investor.