It is valid can help not bad development of the project, thereby and attract investors. However it with high probability, but not 100%.
Agree with you, a bounty program cannot assure 100% probability but it is a one of the ways to help the project to become attracted and known to community. The team here in this project would provide multiple strategy to become successful soon of this project.
Most probably it will be boosting the audiences to the platform. But yes, it would be better if they set up an advertising to a social media.