The airdrops are giving free coins or tokens for one time small tasks. The project's owners need to boost their social media profiles for small rewards. That's not bad. A year ago airdrops have given decent profitable rewards. But now airdrops are famous and getting a large number of participants. Then each participant not getting profitable rewards. Another thing is scammers using this airdrop method to boost their scam social media profiles for nothing. Then we hard to get profitable rewards from airdrops.