This is what I am talking about. A lot of people are quickly selling their share in these bounty campaigns/airdrops the time they have them. Have a lot of experiences from it in the past where I am checking these exchanges where it is listed and you are seeing these offers lower than the rightful price so that they can just be sold easily.
Of course the other people would offer lower until that price just crash. That is the reason some projects are having strict rules when it comes to these bounties/airdrops.
Bounty hunters normally work for 2-3 months without any payment and they receive their tokens once the ICO is over. Now you can't force them to wait any further. Can you imagine a supermarket or a retail store paying the wages to its employees after a 6 month delay? Forcing the bounty hunters to wait anymore doesn't make sense. The project team can encourage them to hold on to the tokens, by announcing additional rewards for those who are willing to do so. But strong-arm tactics are not going to work here.