Is this a scam, everybody who joined this "airdrop" has sent 0.03 ETH. What's going on here?
you can easily count the scam amount that dev stole and ran

I think the lesson from this scam is to never donate to this shady projects, instead use your donation to buy other legit altcoins.
and you are right, those events that needs payment or forced donations are not airdrop !! they are more like ico and sale tokens