There are different type of website & Telegram channel available. where you can get airdrop regularly but i didn’t think airdrop is profitable. Yes it is true airdrop always give free token but it is very low amount which token you will not able to exchange. Still if you want to work for airdrop. You can googled it then google will give you many website link. I advice you if you want to earn free like airdrop you can choice Bitcointalk bounty it will give you opportunity to earn free money.  Bounties (Altcoins) You can start the bounty from here