Actually, I don't believe airdrop. It likes scam. Most tokens from airdrop are useless. I prefer ICOs than airdrop.
I kinda feel the same now, last I applied for +10 airdrops and 9 out of ten were a waste of time, I was doing free marketing on social networks but never received anything. Would be good to get some feedback what criteria needs to be met so the project is legit. I don't sign up if I don't find the project interesting and skip the ones who just have google forms without any context, but still the outcome is so marginal.
I participate on airdrops like 2 weeks. And i already earned live 1.2ETH. For me its wortwhile, most the time i takin parts of airdrops while work