I participated a month in various airdrops. Result is sad. 20 DTA = $ 0.19 and 6 HOT = $ 0.29
All other - scam, or not paid nothing. Waste of time.
I'm making the same experience right now. Recently joined in a lot of airdrops. (as a novice) But so far received nothing.
Anyway, I think the most important thing is to not participate in any airdrops with KYC. Don't want my passport on some shady company's server.