In my experience in doing airdrops, it is a good program issued by an ICO to give their supporters a rewards and they promoting their project/platform to the public audience. Many says that airdrops are shit coins nowadays but if we try to bring back a year ago or more than that , we can say that airdrop are really effective to make money here in crypto industry. As of now , there are lack of airdrops that I encountered that gives us a good amount of money.