Dump Airdrops – Developers generate short-term buzz in hopes that people will eagerly buy the airdrop when it hits an exchange. After, the developer will dump tokens, and laugh all the way to the bank. Very similar to classical pump-and-dump, bait-and-switch schemes. Example occurrence: Manifold NFTs.
Private Key Scams – These airdrops are entirely fake, and are designed to trick users into giving out the private keys of their wallets. This type of scam relies on psychological manipulation, as the scammer will ask participants for their private key, as opposed to their public key.
Information Trolling – Designed to collect personal information. Claim to be giving away tokens with the goal of getting email address, wallet address, social media information, etc. This is a huge problem with airdrops. Inherently, airdrops contain a lot of information about the token recipient. This paper is focused on providing a protocol directed at solving this issue.

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Private Airdrops – A Framework for Zero-Knowledge Privacy