A profitable free airdrop is hard to come by these days, which is part of the reason I rarely cover these types of airdrops. The rewards that protocols airdrop to users for a free action tend to be either very low from the start or are so diluted with farmers due to the low barrier to entry that the reward becomes negligible. Out of all the free airdrops available, only two are worthwhile to engage with. One is EtherMail, which I have previously covered (you can find the EtherMail article her...