Airdrop nowadays have changed their requirements. But before, like in 2017, most airdrops will just ask your eth address or coin address to receive their coins without doing anything. But now, most of them will require you to tweet or like their social media channels to be eligible for airdrop. And the problem these days, is that when you finally receive those supposedly free coins, they are not worth sending to the exchange as you may incur higher tx fee than its actual value. So basically, you just wasted effort.
Men, i missed those airdrops that really gave free tokens to participants without doing so much work or tasks successfully just to get qualified. Projects now are just stubborn and very clever that wanted so much tasks like doing more likely bounty tasks and i am okay with like, follow and retweet stuff but to the extent beyond that is not airdrop anymore. And asking fees to claim airdrop tokens are just not good at all, more likely it's all "fee-drop".
And sometimes, some projects will ask for gas fees from their participants in order to get their share.
So true, airdrops now are very frustrating to deal with because they ask too much conditions like need to buy their tokens first before they give your airdrop shares you worked for. Mostly newbies will only fall for that kind of scheme and now its still blatant acts wherein there are many fake airdrops circulating online right now. I have seen also airdrops asking private keys thru forms which is more severe case of fooling newbie participants.