For DeFi protocol airdrops like those of AAVE and Curve, the eligibility requirements vary. Generally, holding the protocol's native tokens or providing liquidity to its pools are common requirements. For example, in the case of Curve, providing liquidity to its stablecoin trading pairs may increase your chances of receiving an airdrop. Some airdrops may also require you to have interacted with the protocol within a specific time frame, such as making transactions or staking tokens. It's important to carefully read the official announcements and documentation of the protocol to understand all the requirements and ensure you meet them.