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?
Behind that is they want you to buy more of their token so you can deposit their token on their exchange, most airdrops are a trap, they are going to bait you to give you your vital information, and you will never read from them after two or three months, and they are going to do another airdrop.