Depends on the airdrop of course, I've heard some of them don't even give the coins.
But if it's an actually good airdrop, then yeah go for it.
yes, they call aidrop as an easy profit but little did they know, some tokens in airdrop dont have any value when it is released, sometimes it has a value but its too low, usually it dont have any exchangers so there are many people who hold their tokens until the value become higher. i suggest to join in bounty because it is worth of your time to gain knowledge about bitcoin and for sure you you will earn good profit depends on the success of signature campaign, etc.