I also agree with you. Airdrop is a kind of giveaway that is used as a means of promotion, Airdrop participants are usually required to perform certain tasks as a condition for obtaining a number of Cryptocurrency Tokens. But nowadays most of the Airdrops are scams and we should careful. I also signed up several airdrops past 2 weeks and i got tokens only from one airdrop. So it is a waste of our time and it is not easy to get a profit out of it.
I am very sorry to hear from you this experience that you have taken the time to buy a lesson and talk about my personal opinion of airdrops. I think airdropping is a way of wasting time, we also have to exclude a great deal of false airdrop information, it takes a lot of work and little profit, which I think is not worth it.