airdrops they are only giving free altcoins , but most of them are scams , i have been receiving altcoins in airdrops and most of my tokens came from airdrops that i participated , as i said most of them are scams and their tokens is just fo display and nothing to do in cryptoworld . And i think ICO's will not ended because of this airdrops. ICO will be there to continue , and it is better to join in an ICO than in airdrops if you want to have a altcoins that has great value.