问：What is a crypto airdrop? Distribution of free tokens to active members, early adopters, or other user groups 问：Which of these campaigns is an NFT airdrop? Mutant Ape Yacht Club airdrop in 2021 问：What project airdropped 25 million governance tokens worth over $1 billion at the time to its early adopters in 2021? ENS 问：What is a giveaway? A marketing campaign where users get a chance to win a valuable prize after taking certain actions 问：Which of these offers illustrates a bounty campaign? F...