I disagree that 99% of Airdrops are scams! There are MANY that are scams, but there are many that are not. Many of the big players offered airdrops when first starting out as a way of exposure etc, i think it's just a case of DYOR.
I also agree that not all the airdrops are scam, but most of them really are scam, I have joined a lot of airdrops now and only few succeed, also some that those succeed before turned scam too but it a very rarely cases.