I think the reason of dumping Bounty Rewards Coin is to earn more money. They preventing to sell at lowest point. Their plan is to sell then they buyback later after price of coin gets cheaper or lower. Frequently some  ICO projects today price are dump after they enter in exchange. Anyway they have the rights to dump their holdings that's their decision and no one can stop them, on the other hand if price will go up im sure they will regret.