I'm not surprised by this. I realized that Airdrops were cheating half a year ago when I began to participate in them and in bounty campaigns. I think that airdrop is a collection of information to send out spam. Also, some people use the airdrop to pump their social networks and create the appearance of the activity of Twitter, Facebook or Telegram. I filled a huge number of forms of participation in airdrops, I did not receive any standing coin on my wallet.