The idea behind airdrops and Ponzi is different, airdrop you don't need to invest money into the tokens, what they are trying to build is just a strng community unlike Ponzi that says bring your money and we will double it for you. Most of these airdrops won't amount to anything but there is no sin in participating in them
Thanks guys for clearing things out. Has anybody of you participated in airdrops? And was it worth your time?