Airdrops are part of the bounty campaign, hunters with little time will enjoy airdrops.
Advantages of airdrop:
+ Helping the project reach a large number of users and wallets;
+ Help the project to have a beautiful profile (the number of people following Facebook, Twitter, Instagram, Telegram accounts) in a quick time, attracting potential investors;
+ Help the project take advantage of more hunters;
+ Easy to conduct, low cost.
Disadvantages of airdrop:
+ Not many loyal fans. Hunters who have pursued bounty for a few months often love the project

+ The token value that hunter receives is very low;
+ Easy to be abused: many people have hundreds of emails & Telegram accounts to participate in the airdrop as a main profession. They can earn $100-200 USD in a successful airdrop campaign.
Currently, I don't have much confidence in airdrops, even I don't want to waste time with airdrops.