I'm still wondering why developers will organize airdrops and distribute an amount of tokens which is far lesser than the minimum amount of the tokens that can be deposited on an exchange for trading. If you don't want the users to cash out the money, why do you let them waste their time?
simple, airdrop is a part of strategy to spread the word for any cryptocurrency project
because all airdrop participants will always promote their airdrop tokens or coins. so, they can sell it in good price
thats my opinion