The forum must create it's native token and distribute them to members based on their activities.
Tokens must be transferable among forum members but should not be listed on any exchange.
This reminds me of the merit system. Merits were airdropped based on member's activity abd members can send them to each other but can't sell/buy them (sadly, some members do it).
This will also prevent scam projects from running bounty and running away without paying.
How can this prevent them from not paying bounty hunters? And why do we need a new token in first place? Payments can be sent in any of the available currencies.