I think not all airdrops are supported, in spite of all the inconvenience since now a days a couple of airdrops are trap and wasting your possibility and effort when you finish off their shape. regardless, before you have to join any airdrops you require first entire an examination about them for you to keep up a vital separation from trap
it's hard to know whether an airdrop is legit or not because the method they use is almost the same, unlike bounty or ico.
It is not very hard for me. Now they are not legit Airdrops, in my opinion. I am not registering myself in more Airdrops, because it is just a waist of time.