Airdrops were so popular among the crypto-community over the years. One of the key features of the airdrops is, it gives every participant a chance to get some free tokens by completing few tasks. Most importantly it is totally free of charge. But nowadays we frequently see a trend where the organizers of some of the airdrops ask to send a small fee prior to sending the tokens. In some cases, they put a condition saying that in order to withdraw tokens or any fund received from the sale of tokens, it is mandatory to take part in their ICOs. I would rather call such events as "Scam-drops" as they not only dilute the meaning of airdrops, but also make people to move away from future events due to lack of trust.
You can come into a conclusion that there is no more airdrops in the crypto space which worth the effort of yours, so if you are finding something called airdrop from now on then you can consider it as scam drops as your term.
People lost trust so good projects don't follow this type of promotion anymore, think smart and don't waste your time and valuable sensitive data, even money which they ask you as fee.