The last airdrop I claimed was Caldera. It gave me a decent drop of 350$ and another 350$ in 3 months. I don't even know how I was eglible but seems people that active engaged got much more.
That's not too bad of a reward as I myself got a bit from the Caldera airdrop for not doing many tasks there, the price was pretty good after the listing.
A lot of people get those Caldera Tokens from yapping, it's one of the trends now where you have to be able to yapping in order to get a lot of allocations.