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.
Yeah, you're right, Airdrop before is profitable and worth to join, unlike today, most of the airdrops are scams they only collect money from investor's then after they reach their goal they abandoned it.