They now lock down the bounty and airdrop earnings for some period of time. This is aimed at stabilizing the market for such token before the activities of dumpers which are believed to be mainly the bounty and airdrop hunters.
This won't make the situation any better, only slowing it down. As long as they're paying a huge amount of bounty in their token, instead of BTC or ETH, their coin will get dumped immediately. Kinda funny seeing those ICO team complaining about dumping when they are the one who's responsible for that. If they really care about their token price, don't pay bounty using their token. Instead, use BTC, ETH, or any other major altcoins. It's even funnier to see people who invest in such ICO.