i have participated in few bounty campaigns they sent me the tokens on time. the project you have participated may dont want to release them right now due to the market situation or the project scam
Most of the projects are distribute the tokens but this year many projects are not listed in the market so many participants are affected in bounty campaign. I think many projects are not reach the softcap so they plan to stop the listing in market and some projects are completely reliable but current situation is not a right time listing so next year is the perfect year in bounty campaign.