Guys, I will tell you something essential in your life:
There Ain't No Such Thing as a Free Lunch!So when an airdrop seems free, it doesn't. It must have costs associated with it, i.e., your identity in the form of email address, ETH address, phone number, ID card, etc. These data aren't free! Furthermore, you risk your ID sold in the black market.
I got every part you told there, except ETH address.
How can someone be traced through it actually?
We can change a lot of addresses and there's nothing as mandatory use of our current ETH address because that leads to centralization where we are not allowed to use anything except our already used address. This doesn't really makes sense, honestly!
It has been too long since I did not participate in an airdrop, most of which did not bring any value. If airdrop requires you kyc, please be careful because they may be collecting your personal information for use for other purposes.
Correct, and to my knowledge, I think these projects do Airdrop for just 2 causes:
1. To give a better share to their investors (if it's especially for investors like Pundi X and not free) Or
2. They know that their project doesn't have any value and they are going to run away leaving investors and all data providers (KYC) in dark.