I do agree, because most of airdrops are scam. The project sometime scam and do not paying for our job which have promoted their project. I face many times of being scam in airdrop.
First of all we need to decide what means scam, the scan means willingly, on purpose deceive people, in order to get their money stolen. So now, I think, you must agree, the definitely not 99% of air drops are scam.