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?
You should know that sending of governments approved Id is to prove if you are human or some one trying to hide he or her identity. You are only scam if you put really money. If any airdrops ask you to send money that airdrop is scam.