I saw something about bounty payment in their white paper so I guess there is. But I really don't know much about it though
I don't think thats the bounty in the way your expecting.
"Bounty Manager: a collection of contracts for assessing threat via Bounties" - April 2018
I believe the above is what your referring to, and basically is part of what will drive the actual Polyswarm, basicallys its the incentive for security experts to use polyswarm to submit and report security vulnerabilities and actually make use of the system.
You have to remember Polyswarm isn't just a random currency crypto, its a platform for security experts to have incentive to find and share security vulnerabilities that are found to help integrate the IT security field.
Or thats how i understand it, so i don't think they were referring in any way to things like social bounties or anything like that. Which i sort of like as it means they are giving away less tokens and the tokens will maintain their high value after the coins full release to exchanges.