I never give private key and I don't join airdrop that request Eth donation. Are there some other potential risk in joining an airdrop giving for examples my mail address, my twitter and telegram account and other basic information? I also use dedicated profile to join them. Thanks!
The most potential risk will be if you mistakenly input your wallet private keys during join form fill up and to download their wallet application in which it might hack your bitcoin private keys and information. I just wonder why they are asking for donation if they are giving free altcoins, maybe they have other purpose but anyway i never join any airdrop because i am very busy of campaigns and trading these airdrops is just a waste of time for me.