I cannot answer you directly because I'm not into bounty campaigns, but here's my thoughts. Maybe the project is not giving out the bounty because of (1) legal actions, meaning they're very careful specially campaign participants who is on a restricted nation (2) they're afraid that giving out tokens will mean a huge dump on their tokens, rendering it useless (3) not yet on a trading platform (4) scam projects.
I'm not sure about the roadmap though excuse though, because I'm sure that along the line their token distribution is in their roadmap so they should have airdrop everything specially if its scheduled.