I did a lot of registration in the airdrops but there are no airdrops who asked me my password just two conditions must apply never give your private key of your wallet and never give your password
They don't ask your password directly, but sometimes when you have to register on their website, they check whether you use your login/password combination anywhere else (for example, on exchange)
Most people are lazy when it comes to creating passwords, so they use the same word combinations on different sites.