Bounty campaigns are done not just to gather investors but mostly for publicity reasons. It is very important for any project the exposure of their project names by all means especially to social medias and youtube channels.
That is very correct, i also do some bounty campaigns and most of them doesn't care more about the investors, they were after the publicity and to spread their project names in order for people to remember it and share the name to other people friends. One of the bounty campaigns i just did join is the project
https://ilcoincrypto.com/ .If investors came in well that's good but if none , that is also okay as long they spread the projects name.