No, this is only 2018 current condition. If I compare with last year (2017) there are many legit airdrops. Like BLUE, ELTCOIN, EREAL, BITWHITE, REBL, and many more. So, I can say 2018 is the worst time for airdrop. I think the last Airdrop which gives good token was POLYMATH.
I dont agree With u , PRiVCY is good 2018 airdrop and gives fair amount of coins which has its value , Just need to make better research .. but I agree that lot of drops are scam .