This year I received around a dozen airdrops. But most were below $20.
Yet one was $100.
And the biggest one, from the Prom Network, was $250.
I'm not sure whether it fully qualifies as "airdrop" since it was a victory in a small Sprint campaign held by Prom.
But it was run on Zealy for 1 month.
It required to make a lot of twitter reposts and likes.
And a few times it was necessary to install a mobile app and use it.
And all abovementioned are usual prequisites to an airdrop, so I believe it qualifies as such.

The money was really good for the amount of effort I spent.
It took me about 4 hours total to do all the Sprint tasks on Prom Zealy Space.
There were over 100 of tasks but most took around 5 seconds to complete.
The tasks were related to the Prom Ecosystem partners, so I also got to learn about 30 other different projects.
And while doing so I got involved into a few other airdrop possibilities, which i yet have to pursue.

All in all it was fun and I liked the reward.
Prom Network is still running 2 more campaigns, which last five times longer.
And of course I am doing my best there too.