Actually I thought Airdrop is totally a waste of time but your post makes me think of joining any potential Airdrop to earn some $. Let it be even $10 but we're getting that without doing anything, hope I need to research on which Airdrop is good and potential for success rather than depending on luck factor. Lets start researching and spread the word if anything gets succeeded like you.
In 9 out of 10 cases it is a waste of time as you don't even get the tokens to begin with, at least that was my experience, but that also have to do with my my rank. I was Junior Member when applied for airdrops the last time I recall. These kind of stories make me think though...