I received about 6801 TKY from an airdrop/bounty from THEKEY earlier this year. Although I don't remember the specifics of the airdrop, but I am pretty sure it didn't involve doing any task. That's about ~$100 in current market value.

I am currently doing a curated list of 'highly promising' airdrops here - please take a look at my reviews and may be let me know what you think.