Most bounty campaign managers are refusing to pay the tokens on the exact date they set to pay bounty hunters. Some just keep on postponing the date and time for payment. I joined a bounty in june and it ended in august, they promised to pay hunters within 30 days but till now i have not received my tokens. Its quiet sad.
It is just because the never escrowed the fund and they just rely on the team behind the project as they will be the one to distribute the bounty rewards. Though some CM isn't have concerns to their participants and never do follow-ups to the team so it takes months before the participants receive their rewards, it getting worse when totally nothing to received(scam).