I don't participate in airdrops except for major bitcoin airdrops (forks) like bitcoin cash and bitcoin gold. Most airdrops require participants to provide their personal information and I don't feel comfortable giving my info away for a few altcoins.
I agree with you ,and also me too ,i was avoid also to join at airdrop becuase despite some of them will be scam it will not also reward of some ico will not succeed on this project so that is was also less to join at airdrop community, as well .