Although I do not do airdrops but I know that they are also very good ways to make profit as long as you join good and reasonable projects because some of them give reasonable rewards and they are growing well in the crypto market.
On most cases or if we do talk generally airdrops isnt a good way to make profit most of the time unless if you do hit the right project then you might get some amounts but wont really be that big since we do know airdrops do only give a small amount of tokens to the public on each user.
Airdrop is just like a Giveaway for success of ICO
That easy way to earn coin with easy simple
But too much airdrop coin too cheap
Its always been part of the marketing strategy to increase projects existence and awareness and yes this is the easy way to earn tokens but most of the time these airdrops do only give out a full load of shit tokens.