IMHO you can participate airdrop if you have a lot of free time. It like free gambling) Some can give you profit, but you will have to participate hundreds of them)
But participating in airdrop, they have too many fraudulent projects, their campaign is not real, so I less want to participate in, and if there are tokens it is very little, not worth, so I do not Intense with the airdrop.
Just like free lottery ticket) You pay just with you time) But one-two can win) Don't waste time reading about them, just register where they want and forget) Once a month or two check your wallet and check the price of new coins) And all this is for people who have a lot of free time to waste)