Implementing decentralized airdrops via smart contracts faces technical and adoption challenges. Technically, dynamic rule flexibility is hard—smart contracts lack adaptability for evolving criteria (e.g., real-time fraud detection), requiring upgradeable architectures or oracles, risking centralization. Cross-chain compatibility complicates execution, as most contracts are chain-specific, limiting multi-network participation. Security-wise, flawed logic (e.g., reentrancy attacks) or oracle manipulation could drain funds.