This post is truly an eye opener and I hope to join the discussion. I once saw an airdrop that requires the individual to send 0.001 ethereum to an address to receive the so called useless airdrop. Even though the ethereum was meagre but assuming 1000 participants pay 0.001 ethereum that's equal to 1 ethereum. Which of course I know there will be more than 1000 participants. They employ different tactics. It seems like they spend every minute thinking of new ways to scam. People need to be careful of all this tactics being used by online scammers.