One of the campaigns I joined ran for 20 weeks and that is approximately 4.6 months and their coin is not yet listed that's why my tokens have no value yet. (SMT) coin. Did you complete the weeks in the campaigns you joined? And are joining bounty campaigns that are managed by high ranked members? If not, next time you should because, high-rank members that handle campaign are more capable of knowing which project is a scam. Right now, I don't know if you joined scam projects but I think you should still wait for those projects' tokens if you really trust them.
if you received tokens for bounty but they are not listed on exchanges then it is not bounty issue .
bcoz if tokens are not listed then investors who invested in that project are also waiting for exchanges at same time . if team is serious about its project then we can wait for listing , or if you need urgent money then sell token on dex .