I think this is done in order to encourage the community to support the coin and pay attention to it.
To pay the more people to shill and defend the project like what was happening with ebtc and many airdrop participant are shilling the project just like bunch of the shit until the thread got deleted by the moderator.
Yesterday the mod deleted some threads of airdrops that have 'e' in the name of tokens. Like what's in the 'E' name?
It's literally air drop yesterday, it's raining of free coins and everyone is gone crazy from joining them all but later on found out that some of those are just scam and just want to make a hype.
It's funny that you just didn't know which is scam and which is not. I'm afraid that maybe soon there will be no more bounty campaigns and will be replace by these airdrops.