Even though I'm no more sourcing for airdrop now. I can say that from late 2019 to 2021, I made a few bucks from it. I can remember the Blockchain airdrop where they give $25 for just having an account and doing KYC.
Also, there was also an airdrop from Houbi, I think they rewarded around $5 then. hahaha
While it's a small amount, it's something one can do in their free time and get rewarded.
Of course, you can make airdrops from time-tested projects. Now I don't spend much time on it. But here, too, you can’t immediately guess what will shoot. But sometimes you can get a good bonus