DeFi cryptocurrency airdrops are strategic marketing moves in the world of decentralized finance in which tokens or coins are provided to eligible participants. The main purpose of such initiatives is to increase people's awareness of the project, generate interest around a product and token, as well as reward its early adopters. It is often necessary to take certain actions in order to receive a reward. This variety may include such actions as trading, minting NFT,  following a crypto project’s social media accounts,  sharing their posts, etc. The winners of cryptocurrency airdrops can freely trade their rewards, unless the token hasn't been listed on crypto exchanges. In this case, you have to wait till the crowdfunding stage is over to buy, sell or exchange your cryptocurrency.