Some airdrops require personal info from their users like government approved ID proof, a selfie with it, contact number, email, address etc. Does this information really required? How to know if somebody is scamming you for asking this kind of information?
Airdrop- are literally just simply free coins just waiting for you, also a decision regarding marketing strategy, a way to spread awareness to the relevant audience of potential investors and eventual enthusiasts, coins team will from time-to-time, do airdrops.