the airdrop for me its super profitable to gained money, even its all free but you need also to support them, what i mean is if you buy some token or coin for better,. i know they dont yet if they success the project i just suggest its get to support them, even its small money you spend in that project but soon your spend money to his project your profit make 3x income.
It is not all the Airdrop projects are faithful to their patrons. I used to support airdrops with little ether as they demanded but some of them never kept their part of the bargain and ran away with money. I can not categorically castigate Airdrops because I have benefited from some also. Yea good money.