The last airdrops I got received was 2017, then since after that up to now I never join in any of the airdrops programs due to it looks scary that is because sometimes it become an open door to scammer to anyone who will participate in it. And it os true that most of them are not giving the rewards.
I've also given advice like this to my friends after hearing some complaints from those who often follow the Airdrop program, because the Airdrop program is very valid and I've seen it also in the same year, 2017, after that only one or two were accepted valid, the rest is just a scam.