Yes it is, but it depends on the Airdrop if the project is legit or scam. If you do an Airdrop of a very good project you can make a lot money, but the key is to have patience and don't sell your Airdrop tokens! I have an interesting Airdrop today, it looks very promising and can be the next ETH or better: https://bitcointalk.org/index.php?topic=5050174.0