Airdrops is absolutely beneficial for those who earn token in easy ways and in less time. It depends upon the choice, not every airdrop give you a best amount of profit, but some of the airdrop is good and give you token which have high value in the market and it give you more benefits.
It's definitely beneficial for those who participate in the airdrop because it's free of cost and even if the token doesn't appreciate that much in value, you still have somehow gained on your part. You somehow gained something for free.