Only a few times I followed the airdrop, some paid well and some did not pay.
good for you that you only follow airdrops a few time but not all the time like most of us here do because if you do , you will feel how its like to be scammed and not paid . you feel verry tired from long days / months of working and in the end your efforts are not paid off . whats good of you is that you still got paid for the few times you spent doing them .
I have never experienced anything like you, having to sign and hand over funds to them before they send their airdrops to participants.
what you mean by that ? sign a meesage on the wallet address that you send to them ? to be able for them to verify that it was you so that they can send your rewards ? thats also new to me .