With the popularity of virtual currencies, airdrops have become a common means to attract users, but they have also given rise to a large number of scams. Many counterfeit projects use 'free coin distribution' as bait, requiring users to provide wallet private keys, mnemonic phrases, or click on malicious links. Once deceived, assets will be stolen instantly. Genuine airdrops will not ask for sensitive information and do not require a transfer before receiving coins. Users should be vigilant, only participate in activities announced through official channels, and use dedicated cold wallets to receive airdrops to reduce risks. Remember: There is no such thing as a free lunch, and preventing fraud is better than chasing profits.