What i know, KYC means Know Your Customer ! Bounty hunters are there to Support ICO Project to spread the word about the project .. BUT as soon as the Project manager mention KYC then many Hunter run away ! Why? Is it because people don't want review their identity for security reason or people are joining campaign with bot software ..
Probably both, but the thought that there is a big possibility that your sensitive information will go through the black market will cause a big fear even for those honest bounty hunters if there is no such fear then bounty hunters are obliged to go through KYC verification.