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.
Airdrop is a test case. It is not free. You will agree to be used for the testing or improving the community base of the coin so that activity is generated. So to me it is very rewarding.