Yes- airdrops may require private keys or some other personal information in order to participate. Of course, the airdrop then carries out malicious acts with the information they have been given.

In response to OP- I've been involved in several successful airdrops. However, most in earlier days of crypto. I got 25 CUBE when it launched, which I was able to sell for .005 each some years ago. DeepOnion (which I participate in) is also very lucrative (although it's realistically more of a signature campaign than an airdrop).