Airdrops are usually free, although sometimes there might be some kind of airdrops where there will be some requirements to claim then, but the rate at which there are scammers infiltrating the network is making people to not trust any airdrop that is not completely free.

So, if you see any airdrop that’s asking for fees or whatever that has to do with money, it’s best to stay clear from them and look for others. I have done airdrops in the past, and they can be frustrating, you choose so many of them and just few will be successful. A lot of them will have you do lots of tasks and no reward, you just have to move on.