Bounty and airdrop can not kill a project, only a bad project kill itself, get it straight, mate. Prices go low after bounty distributed, yes but that ain't the main reason for a project to die.
The price will go to the bottom when there was no enough volume in the market but you should remember the different thing was also happening with the project too. There were so many reasons why the dump can happen but people just take or focus into the one reason that I think that's not fair.