Its free, no risk at all. But the hassle part is you have to do a lot of tasks. This is for people who have so much time in a day.Everytime I see that there is new airdrop, I sign up on it. It is free money. I already got more than $5000 for free just by signing up on airdrop forms. But you should be careful because not all airdrops are legit. Some airdrops are asking you to put your private key on your MEW.